问题
单项选择题
在立体的三视图中，有些表面和表面的交线处于不可见位置，在投影图中用（）表示。
A、虚线
B、细实线
C、粗实线
D、不表示
答案
参考答案：A
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在立体的三视图中，有些表面和表面的交线处于不可见位置，在投影图中用（）表示。
A、虚线
B、细实线
C、粗实线
D、不表示
参考答案：A
| 从方框中选择适当的短语，用其正确的形式填空。 | |
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