假想用一个平面作为剖切平面，把形体切开，移去（）与（）之间的形体后，将剩下部分形体向相应的投影面投影所得到的视图，称为剖面图。
查看答案
剖面图的标注包括三部分：剖切位置线、（）和编号（图名）。
根据剖切范围的不同，剖面图有全剖面图、半剖面图和（）剖面图三种。
There are five short dialogues about taking risks. Listen carefully, and choose the best answer to the question.[音频]Q: Why is the man not a risk taker?
A. He does not like risk.
B. He is a worrier.
C. He does not want to get hurt.
D. His parents don't like risk.
Q: What is windsurfing like?
A. Like sailing.
B. Like boating.
C. Like parasailing.
D. Like skiing.
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