【单选题】【消耗次数：1】
二维随机变量<imgwidth="46"height="21"v:shapes="_x0000_i1113"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image159.png">概率密度为<imgwidth="203"height="50"v:shapes="_x0000_i1114"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image161.png">则常数<imgwidth="16"height="19"v:shapes="_x0000_i1115"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image163.png">为（）
①
<imgwidth="37"height="19"v:shapes="_x0000_i1116"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image165.png">
②
<imgwidth="42"height="41"v:shapes="_x0000_i1117"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image167.png">
③
<imgwidth="40"height="19"v:shapes="_x0000_i1118"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image169.png">
④
<imgwidth="39"height="19"v:shapes="_x0000_i1119"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image171.png">
参考答案：
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【单选题】
设随机变量<imgwidth="13"height="15"v:shapes="_x0000_i1216"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image328.png">和<imgwidth="13"height="17"v:shapes="_x0000_i1217"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image330.png">的密度函数分别为<imgwidth="131"height="48"v:shapes="_x0000_i1218"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image332.png"><imgwidth="140"height="50"v:shapes="_x0000_i1219"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image334.png">若<imgwidth="13"height="15"v:shapes="_x0000_i1220"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image328.png">与<imgwidth="13"height="17"v:shapes="_x0000_i1221"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image330.png">相互独立，则<imgwidth="57"height="21"v:shapes="_x0000_i1222"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image336.png">（）
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【单选题】
随机变量<imgwidth="13"height="21"v:shapes="_x0000_i1042"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image036.png">的概率密度<imgwidth="132"height="50"v:shapes="_x0000_i1043"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image038.png">则常数<imgwidth="29"height="19"v:shapes="_x0000_i1044"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image040.png">（）
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【单选题】
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<imgwidth="84"height="25"v:shapes="_x0000_i1198"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image293.png">
②
<imgwidth="92"height="25"v:shapes="_x0000_i1199"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image295.png">
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【单选题】
随机变量<imgwidth="19"height="17"v:shapes="_x0000_i1095"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image127.png">服从正态分布<imgwidth="50"height="21"v:shapes="_x0000_i1096"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image129.png">，则<imgwidth="75"height="21"v:shapes="_x0000_i1097"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image131.png">（）
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①
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②
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③
<imgwidth="136"height="42"v:shapes="_x0000_i1036"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image024.png">
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设X是一随机变量，<imgwidth="17"height="25"v:shapes="_x0000_i1298"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image471.png">为任意实数，<imgwidth="41"height="21"v:shapes="_x0000_i1299"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image473.png">是<imgwidth="19"height="17"v:shapes="_x0000_i1300"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image316.png">的数学期望，则（）
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【单选题】
设二维随机变量<imgwidth="187"height="26"v:shapes="_x0000_i1135"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image189.png">，且<imgwidth="19"height="17"v:shapes="_x0000_i1136"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image127.png">与<imgwidth="15"height="17"v:shapes="_x0000_i1137"src="http://wljy.whut.edu.cn/uploadfiles/word/xxdsb08.files/image185.png">相互独立，则（）
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【单选题】
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1
随机题目
【单选题】
关于牙龈瘤的叙述，哪项是错误的（）
①
女性多见，与内分泌有关
②
可以破坏牙槽骨壁
③
一般应将病变波及的牙齿拔除
④
病变波及的骨膜及邻近骨组织需要去除
⑤
因非真性肿瘤，切除后不易复发
【单选题】
女性，13岁，左面部肿大、畸形，随年龄而增长。查：左鼻及唇颊增大、下坠、质软，面部及躯干皮肤有多处棕色斑。最可能的临床诊断是（）
①
嗜酸性粒细胞增生性淋巴肉芽肿
②
囊性淋巴管瘤
③
神经纤维瘤病
④
放线菌病
⑤
海绵状血管瘤