题目内容

按结构分有:紧急式按钮、钥匙式按钮（选择开关）、旋转式按钮（选择开关）、保护式按钮等。

A. 对
B. 错

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131.In the past years, we have made efforts to develop business ____.

A.in this line
B.for the section
C.of this
D.on this line

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A.it
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A.receive
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A.account
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C.amount
D.amounts