【单选题】【消耗次数：1】
二元函数的极限<img src=https://huaweicloudobs.ahjxjy.cn/589EF6D69350D74A7C29C1FF261E6782.png title=QQ图片20160224220959.png alt=QQ图片20160224220959.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/02D1E47B8FC1AF8641AD83C898E56860.png title=QQ图片20160224221317.png alt=QQ图片20160224221317.png/>
参考答案：
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相关题目
【单选题】
设D是圆环<img src=https://huaweicloudobs.ahjxjy.cn/C1E9D12458DFD4A14CD3882562ECD317.png title=QQ图片20160224231208.png alt=QQ图片20160224231208.png/>，且<img src=https://huaweicloudobs.ahjxjy.cn/19CA4355701DCCA8E9BFC90709B1C2E6.png title=QQ图片20160224231228.png alt=QQ图片20160224231228.png/>则<img src=https://huaweicloudobs.ahjxjy.cn/D387AD7A8CB622BCD1F542C7C350B136.png title=QQ图片20160224231244.png alt=QQ图片20160224231244.png/>（ ）
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<img src=https://huaweicloudobs.ahjxjy.cn/9E7A64637000AEC0789E48D1E96AD66E.png title=QQ图片20160224231302.png alt=QQ图片20160224231302.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/AFF8BA7BECE58AC3901A521D7A606F30.png title=QQ图片20160224231314.png alt=QQ图片20160224231314.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/7E7DDA627E10663C0016B52FA149DC3A.png title=QQ图片20160224231331.png alt=QQ图片20160224231331.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/12F7546764221D5997C3F99846C7FF70.png title=QQ图片20160224231344.png alt=QQ图片20160224231344.png/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/8D7C7A8EE3EEB3AF2AD9D0586F98C6E1.png title=QQ图片20160108161124.png alt=QQ图片20160108161124.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/6841A05BCD04EBC5A5F1BC6999AA0046.png title=QQ图片20160108161139.png alt=QQ图片20160108161139.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/C5E09089BFFE2FB5001B0A653B00EA69.png title=QQ图片20160108161151.png alt=QQ图片20160108161151.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/983404DCA68270522F6155EC18BF7E8A.png title=QQ图片20160108161211.png alt=QQ图片20160108161211.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/72B88F20F3656223FBD4D527F304E1CC.png title=QQ图片20160108161221.png alt=QQ图片20160108161221.png/>
【单选题】
设<img src=https://huaweicloudobs.ahjxjy.cn/EA6FB79FF8DF7A9F3A2D0CEB093C717F.png title=QQ图片20160224214006.png alt=QQ图片20160224214006.png/>在<img src=https://huaweicloudobs.ahjxjy.cn/DF3DA077C2189146990B3800DA1E18ED.png title=QQ图片20160224214023.png alt=QQ图片20160224214023.png/>的偏导数存在，则<img src=https://huaweicloudobs.ahjxjy.cn/61AF63E59A60D6B49960C25A0B85414F.png title=QQ图片20160224214038.png alt=QQ图片20160224214038.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/588DCE737E539AFE5318232DBC0C8858.png title=QQ图片20160224214107.png alt=QQ图片20160224214107.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/1898B210FBB62DA4DA7997BB95A4D586.png title=QQ图片20160224214125.png alt=QQ图片20160224214125.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/C9D08ECB097A69F4F22594D120D687E7.png title=QQ图片20160224214140.png alt=QQ图片20160224214140.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/6101D759594C1C2892D8E9F8195520C5.png title=QQ图片20160224215328.png alt=QQ图片20160224215328.png/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/F22E424670D48EA8B00BF875A572F6D9.png title=QQ图片20160108102117.png alt=QQ图片20160108102117.png/><img src=https://huaweicloudobs.ahjxjy.cn/A7B8AB7EFE9A8EC7C2D83F83CE6AD874.png title=QQ图片20160108102145.png alt=QQ图片20160108102145.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/D1158E7E2A11A9F3FF830DEDCACFCE40.png title=QQ图片20160108102201.png alt=QQ图片20160108102201.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/5E167DEDAC45510EE9C136A2850BAEEB.png title=QQ图片20160108102216.png alt=QQ图片20160108102216.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/EAC49782558574996690E7E54E04DB82.png title=QQ图片20160108102237.png alt=QQ图片20160108102237.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/A97A1286364D01DF4D8429E6D441571A.png title=QQ图片20160108102252.png alt=QQ图片20160108102252.png/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/A7680902CB99663BA6E23408C5C4ABFB.png title=QQ图片20160108111419.png alt=QQ图片20160108111419.png/><img src=https://huaweicloudobs.ahjxjy.cn/F7C836FE5C2376120035EBE3D8C699B9.png title=QQ图片20160108111439.png alt=QQ图片20160108111439.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/51A1F02268CD4EAF0D1BB4C81A2C8981.png title=QQ图片20160108111454.png alt=QQ图片20160108111454.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/FAF724DB88B6F9338819B0ACF799FC7E.png title=QQ图片20160108111507.png alt=QQ图片20160108111507.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/D6D9581D650D608E065C2881AE35D6A8.png title=QQ图片20160108111520.png alt=QQ图片20160108111520.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/F1950DBF13A5E2F6DF6D0A2E7B40036B.png title=QQ图片20160108111532.png alt=QQ图片20160108111532.png/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/711964D1CA5D3A0F1C363FEDDE9F9E1D.png title=QQ图片20160108110719.png alt=QQ图片20160108110719.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/C7AB4B181E7BCF9BFDCDA87CAEB15A85.png title=QQ图片20160108110843.png alt=QQ图片20160108110843.png/>
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【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/D1AD9CC020FD6A3EF431D89A836BAC1C.png title=QQ图片20160107174737.png alt=QQ图片20160107174737.png/>
①
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<img src=https://huaweicloudobs.ahjxjy.cn/7685B4796DEEFB6F28EB1E89F99C9953.png title=QQ图片20160107174812.png alt=QQ图片20160107174812.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/1E15256789247ADBB5B14BD99570D9AD.png title=QQ图片20160107174824.png alt=QQ图片20160107174824.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/5FDE41C37AB2607F2BD262CE5B0681F1.png title=QQ图片20160107174839.png alt=QQ图片20160107174839.png/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/105E111DA681E95D88E4E4152F4C46E2.png title=QQ图片20160108165131.png alt=QQ图片20160108165131.png/><img src=https://huaweicloudobs.ahjxjy.cn/552A8C09885689EB452DA3865ADAD75D.png title=QQ图片20160108165150.png alt=QQ图片20160108165150.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/ADB11703F3BF0BE78DC47426463EAF9B.png title=QQ图片20160108165201.png alt=QQ图片20160108165201.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/CF13F3D7FB0D5D27421972F547B9024D.png title=QQ图片20160108165212.png alt=QQ图片20160108165212.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/4C5A9407AF48564313C1878511BA6749.png title=QQ图片20160108165227.png alt=QQ图片20160108165227.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/F67EF9F84F4FF33BA448182B54A32743.png title=QQ图片20160108165240.png alt=QQ图片20160108165240.png/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/E9CCE99ABC3D90DD9271185233946874.png title=QQ图片20160108175255.png alt=QQ图片20160108175255.png/><img src=https://huaweicloudobs.ahjxjy.cn/28D6F7A14E90CAFB479D1D056702222C.png title=QQ图片20160108175305.png alt=QQ图片20160108175305.png/>
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-1
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0
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1
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2
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/BB6602F8EBCDCBC4325AC6C2D402AC62.png title=QQ图片20160108172103.png alt=QQ图片20160108172103.png/><img src=https://huaweicloudobs.ahjxjy.cn/2185028B122EA820C3F12899EF40B3B5.png title=QQ图片20160108172114.png alt=QQ图片20160108172114.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/CC23C6DB5BA0BF66BBFFC2864C452A86.png title=QQ图片20160108172123.png alt=QQ图片20160108172123.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/EED4D03BD0C27BA6DF81137CB7AD483D.png title=QQ图片20160108172134.png alt=QQ图片20160108172134.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/161D2BDBBB638F1AEC50FA43244D2A9D.png title=QQ图片20160108172143.png alt=QQ图片20160108172143.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/3E2F5DB12481695A27D0760789A13712.png title=QQ图片20160108172158.png alt=QQ图片20160108172158.png/>
随机题目
【单选题】
以下关于芡色的讨论，正确的是（ ）。
①
芡色就是指芡的色泽
②
错用芡色既不美观，又影响菜肴的质量
③
红芡又分大红芡、深红芡、浅红浅、紫红芡、嫣红芡
④
由咖喱调出的是深黄芡。