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【多选题】
下述哪些工作,用变电站(发电厂)第二种工作票? ( )A.
在保护出口的发电机组热工保护及其相关回路上工作，需停用高压设备。
B.
在保护出口的发电机组热工保护及其相关回路上工作，不需停用高压设备或不需做安全措施。
C.
在保护出口的发电机组水车保护及其相关回路上工作，不需停用高压设备或不需做安全措施。
D.
在保护出口的发电机组水车保护及其相关回路上工作，不需停用高压设备但要做安全措施。
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【单选题】They happened to ______for Tianjin when we got there.
A.
leave
B.
have left
C.
leaving
D.
had left
【单选题】They us willingly but they happened to be short of hands, too.
A.
would help
B.
would have helped
C.
were going to help
D.
must have helped
【简答题】A wise man was walking from one town to another with a few of his followers, and they happened to pass a lake. So they stopped there to 1 for a while, and the wise man said to one of his followers, “I...
【单选题】They______ us willingly but that they happened to be short of hands, too.
A.
would help
B.
would have helped
C.
were going to help
D.
must have helped
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