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【多选题】
组合体的视图选择中,主视图的选择是关键,主视图确定以后,俯视图和左视图的投影方向也就确定了。那么,主视图选择原则是()A.
应该尽量反映立体的形状特征。
B.
应使主视图和其它视图的虚线最少。
C.
应使主视图的虚线最少，其它视图可以不考虑。
D.
使主要表面平行或垂直于投影面。
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Why were you so late for work today? to the office was very slow this morning because of the traffic accident.
A.
Drive
B.
Drove
C.
Driving
D.
That driving
【单选题】—Why were you so late this morning? —I _____ in heavy traffic for an hour on the way here.
A.
have been caught
B.
have caught
C.
had caught
D.
was caught
【单选题】听力原文：W: Why were you so late? M: The train was scheduled to leave at half past six, but it was delayed three hours due to the rain. Q: When did the train leave? (12)
A.
6: 30.
B.
8: 00.
C.
9: 30.
D.
3: 30.
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