问题
单项选择题
视图中的任一封闭线框，可能是（）
A．物体上的一个面的反映实形的投影
B．两平齐的形体表面间的分界线
C．两面交线的投影
D．有积聚性的面的投影
答案
参考答案：A
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视图中的任一封闭线框，可能是（）
A．物体上的一个面的反映实形的投影
B．两平齐的形体表面间的分界线
C．两面交线的投影
D．有积聚性的面的投影
参考答案：A
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| Mrs. White _1_ in a school. It is Sunday. She has _2_ classes. At eight in the morning, she _3_ to a shop and buys a nice dress. She puts it in her bag and then buys _4_ cakes for her children. At eleven she _5_ home. She wants to put on her new dress, but she _6_ find her bag. She calls the shop assistant (售货员), "Hello, Mrs. Black. This is Mrs. White. Can you help _7_ find my bag? _8_ in your shop." "Of course, Mrs. White," says the assistant. "We found three bags here. But which one is _9_?" "I'm _10_," says Mrs. White, "I can tell you which one is mine." | ||||
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