画剖视图时，不管情况如何，一律应标出剖切位置及剖视图的名称。
查看答案
局部剖视图的波浪线可以用轮廓线代替。
A. 对
B. 错
机件上的肋板当剖切平面通过肋板厚度的对称平面或轮辐的轴线时，这些结构（）剖面符号。
The treatment will continue until the patient reaches the point ________ he can walk correctly and safely.
A. when
B. where
C. which
D. whose
There are several research centers in China ________ a certain disease called Bird Flu is being studied.
A. which
B. where
C. when
D. what
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