按平面与三个投影面的相对位置不同，平面可分为三类：（）平面、（）平面、（）平面。
查看答案
平面内的投影面平行线有三种：平面内的（）、（）、（）。
Which the following statement is NOT the principles mentioned in the video?
A) Being clear with the purpose of your call.
B. A) Being clear with the identity of the person you are talking.
C. A) Trying to talk to the ‘BOSS’.
D. A) Talking through all the details.
Facial expressions are not important at all since people cannot see my face on the phone.
A. 对
B. 错
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