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【单选题】
图b 中外径千分尺上数字2 标注出的双面塑料套的作用是?A.
保护外径千分尺在架子上夹紧时不受损伤
B.
作为修饰防止腐蚀(手汗)
C.
避免握把手热弯曲
D.
避免手温传递到外径千分尺上
E.
为了加固握把并避免握把因测量用力过大而弯曲
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皮皮学刷刷变学霸
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【简答题】电动机外壳带电的原因是什么?应如何进行此故障的检修?
【单选题】Not until all the fish died in the river _____ how serious the problem of water pollution was. [ ]
A.
did they realize
B.
they did realize
C.
had they realized
D.
they had realized
【单选题】Not until all the fish died in the lake __________ how serious the pollution was.
A.
did the villagers realize
B.
the villagers realized
C.
realized the villagers
D.
do the villagers realize
【单选题】Not until all the fish die in the river ____ how serious the pollution was. [ ]
A.
did the villagers realize
B.
the villagers realized
C.
the villagers realized
D.
didn't the villagers realize
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