Dave knows where he will be living in five years.
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Clavin knows the job he wants to do.
A. 对
B. 错
Clavin wants to work in cyber law.
A. 对
B. 错
Woo Sung doesn‘t want children.
A. 对
B. 错
下列几个平面中,相对于三个平面的倾角有两个为90°的是( ).
A. 一般位置平面
B. 水平面
C. 铅垂面
D. 侧垂面