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问题 判断题

铰孔是用铰刀对粗加工的孔进行精加工。

答案

参考答案：对

选择题
函数y=
x
+1（x≥0）的反函数是（　　）
A．y=x2+1（x≥0）B．y=x2+1（x∈R）C．y=（x-1）2（x≥1）D．y=（x-1）2（x∈R）
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选择题

7. Dave lost his job and was short of money, so ______his flat and move in with his brother.

A．that he did was to sell

B．what he did sell

C．what he did was sell

D．what he did sold.
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