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【单选题】
起动机机械开关接触面如有轻微烧蚀时，可进行修磨，触点的标准厚度为（）A.
4.5mm
B.
3.5mm
C.
2.5mm
D.
1.5mm
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【简答题】A．Because it has plastic wheels. B．Because it has plastic tires. C．Because it has a plastic frame. D．Because it has no metal parts.
【单选题】______ I can see, the two wheels which are supposed to turn round do not turn atound.
A.
As long as
B.
As far as
C.
So long as
D.
As soon as
【简答题】There are ___ wheels on the step. Two wheels are directly installed on the ____, which are called auxiliary wheels. The other two wheels are installed on the step chain to make the step and the step c...
【单选题】如下图所示,利用直流通断法来判断同名端正确的是
A.
电流表读数在开关K闭合很久后才能读数
B.
电流表读数在开关K闭合一瞬间就要读数
C.
在开关K闭合或者断开一瞬间电流表的读数是一致的
D.
电流表读数在开关K闭合很久后读数不为零
【单选题】如下图所示,利用直流通断法来判断同名端正确的是
A.
电源、导线、电流表均为直流。
B.
电源、导线、电流表均为交流。
C.
电源、导线均为直流，电流表为交流。
D.
电源、导线均为交流，电流表为直流。
【单选题】Thomas ________ the army for two years,so he misses his mother very much.
A.
has joined
B.
has taken part in
C.
has been in
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