气焊5～6mm厚的钢板，应选用直径为（）mm的焊丝。A.1～2 B.2 C.3～4_爱下问搜题

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问题单项选择题

气焊5～6mm厚的钢板，应选用直径为（）mm的焊丝。

A.1～2

B.2

C.3～4

D.4～6

答案

参考答案：C

选择题

Americans eat____ vegetables per person today as they did in 1990.

A．more than twice

B．as twice as many

C．twice as many as

D．more than twice as many

名词解释

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