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【单选题】
交流接触器若操作频率过高会导致（ ）。A.
铁心过热
B.
线圈过热
C.
主触点过热
D.
控制触点过热
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反馈参考答案：
举一反三
【简答题】match each sentence with the corresponding picture.
【简答题】Match each term with its corresponding picture
【单选题】旅客列车乘务员胸章牌(长方形职务标志)戴于左胸口袋上方正中,下边沿距口袋( )处(无口袋的戴于相应位置),包含单位、姓名、职务、工号等内容。
A.
0.5厘米;
B.
1厘米;
C.
2厘米;
D.
3厘米;
【简答题】Match each statement and its corresponding picture
【判断题】When cutting brittle metal, cutting heat mainly comes from deformation heat in shearing region.
A.
正确
B.
错误
【单选题】The cutting tool removes metal ______it travels past the revolving workpieces.
A.
for
B.
as
C.
so
D.
if
【简答题】Match each statement with the cortesponding picture.
【单选题】The cutting tool removes metal ______it passes through the rotating workpiece.
A.
before
B.
as
C.
since
D.
after
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