【单选题】施工现场临时用电必须采用( )三相五线接零保护系统的要求。
【单选题】The deposits should be scraped away
A.
The sediments are to be scraped away
B.
The dust is to be washed away
C.
The defects are to be set right
D.
The nuts of the bolts are to be tightened
【简答题】检查发电机转子滑环时,滑环的光洁度要 ,滑环的绝缘性应 。
【单选题】We scraped the old paint from the furniture.
【多选题】下列关于施工现场临时用电要求中,正确的有( )。
E.
必须按照“开关箱一分配电箱一总配电箱”顺序送电
【简答题】完形填空。 At our school,we sometimes have a special day to help others.Last year we went to an old people's 1 and sang songs and performed a play for 2 .The old people were very 3 .We should be allowed to...
【简答题】图案填充命令可以使用对话框操作来填充图形中的一个( )
【多选题】下列关于施工现场临时用电要求中,正确的有( )。
E.
必须按照'开关箱。分配电箱。总配电箱'顺序送电