对于逆变侧单相故障导致的换相失败,换相失败的持续时间一般不超过()。
A.100ms
B.200ms
C.20ms
D.10ms
参考答案:A
短文改错(共10小题;每小题1分,满分10分)
An Australian farmer found the kangaroo caught 51.
in the fence around his farms. He thought the poor 52.
animal was injured, but the kind farmer took off his 53.
jacket and put on the animal. Then he started trying 54.
to cut the fence to free the animal. But as soon as 55.
the kangaroo were free, it jumped up and ran away 56.
with the jacket. The farmer was worried because of his 57.
wallet was in the pocket. But, to my surprise, when 58.
he gets home, he saw the animal waiting at the door, 59.
sill wore his jacket with the wallet in the pocket. 60.
( )是在生产及服务的全过程按质量管理文件体系制定的程序、标准工作要求及目标分解的岗位职责进行操作运行。
A.质量体系的运行
B.质量体系文件的编制
C.质量管理体系的建立
D.质量体系的维护