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【单选题】
三相系统中发生的短路有4种基本类型，三相短路、（）、单相接地短路和两相接地短路。A.
短路
B.
两相短路
C.
短路
D.
瞬时短路
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举一反三
【简答题】A. Live near to a noisy street. B. Watch TV before bed. C. Play on your cell phone before bed. D. Stop drinking tea or coffee early in the day.
【单选题】You _______ watch TV before bed. It will stop you from sleeping.
A.
should
B.
shouldn't
C.
have to
【单选题】How often is the bus scheduled to pass their stop?
A.
Every 21 minutes.
B.
Every hour.
C.
Every 30 minutes.
D.
Every 9 minutes.
【单选题】Trains stop here in order to ______ passengers.
A.
get off
B.
pick up
C.
pull up
D.
bring up
【简答题】stop________
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