题目内容

按钮开关结构中有常闭触头，常开触头和复合触头。

A. 对
B. 错

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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

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

132.We will see to ____ that the L/C is opened within the stipulated time.

A.it
B.make
C.let
D.them

133.We expect ____ large orders from Europe in the near future.

A.receive
B.to receive
C.to receiving
D.being received