单项选择题

When _________, the young people are expected to live independently and take care of themselves in the U.S.

A、they earn enough money
B、they come to a certain age
C、they get married
D、they have their own kids
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绘制切割体的三视图,往往要先绘制出完整形体的三视图

答案: 是的,绘制切割体的三视图通常需要先绘制出完整形体的三视图。这是因为切割体是由完整形体经过切割得到的,因此,了解完整形体的...
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