【单选题】
已知一立体的主视图和俯视图,关于它的左视图,哪一种判断是正确的<img src="https://upload.icve.com.cn:89/ssykt/y@0558842F4F1489681A48F02C0BBC3B4B.png/download?time=636534318167593943&token=3C011857C82CBAC7A9D804F1ADC7BD2B&filename=%E8%87%AA%E5%8A%A8%E4%B8%8A%E4%BC%A0p5elah6ofilfkbdrcydsgg20180205125016.png"/>
【单选题】
直线AB的正面投影与OX轴倾斜,水平投影与OX轴平行,则直线AB是( )
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水平线
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正平线
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侧垂线
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一般位置线
【单选题】
A点坐标为(10、20、30),B点坐标为(30、20、30)则AB距离为______。
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正垂线
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侧垂线
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正平线
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铅垂线
【单选题】
mso-bidi-font-family:Times New Romanmso-bidi-theme-font:minor-bidi;
background:white;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:
AR-SA">下列描述不正确的是
【单选题】
化工设备图常选用 两个基本视图, 设备常选用 两个基本视图。1. 卧式 2. 立式 3. 主、俯 4. 主、左
【判断题】
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background:white;mso-ansi-language:EN-US;mso-fareast-language:ZH-CN;mso-bidi-language:
AR-SA">化工设备上管口的径向方位,可以在俯视图(或左视图)上表达,也可以用管口方位图表达
【单选题】
在设备布置图中,EL的含义为 。标高的单位是 ,保留到小数点后 位。1.米 2.标高 3.二 4.三
【单选题】
设备平面布置图的定位尺寸主要以 为基准进行标注,其剖面图上的标高基准为 。1.设备的中心线 2.建筑定位轴线 3.地面 4.海平面
【单选题】
轴线垂直H面圆柱的最前轮廓素线在左视图中的投影位置( )。