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【简答题】
真空断路器的真空灭弧室，只要灭弧室外壳不破损，“真空”破坏后仍可安全运行。()
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皮皮学刷刷变学霸
举一反三
【单选题】The manager ______ the worker how to do it, or the accident couldn’t have happened.
A.
couldn’t have told
B.
ought to tell
C.
could have told
D.
mustn’t have told
【单选题】When and where to enjoy our summer vacation _____ yet. [ ]
A.
aren't decided
B.
isn't being decided
C.
hasn't been decided
D.
haven't been decided
【单选题】—Where are you going for your holiday? —Well, we ______ yet. [ ]
A.
haven't decided
B.
hadn't decided
C.
don't decide
D.
didn't decide
【简答题】The
worker decided to finish the work on ____.A. contact B. schedule C. stress D. staff
【单选题】The boss____________ the worker how to do it, or the accident couldn't have happened.
A.
can't have told
B.
ought to tell
C.
could have told
D.
mustn't have told
【单选题】The old worker decided to ________ next year and moved back to the country.
A.
request
B.
retreat
C.
retire
D.
recommend
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