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【单选题】
用固定转速(脉冲)测量时间的瓦秒法检定电能表误差时,当被测电能表转N转时,被测表的相对误差为r=t'-t/t×100%。若不考虑标准功率表和秒表的误差,这时电能表的真值为()。A.
pt'
B.
pt
C.
P/t
D.
pt'+pt
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举一反三
【单选题】You must have said something to ( ) her, as she was crying after talking with you.
A.
defend
B.
direct
C.
confuse
D.
offend
【单选题】You must have said something to ___ her, as she was crying after talking with you.
A.
defend
B.
offend
C.
confuse
D.
direct
【简答题】阿留申低压发展最盛的季节是:( )季
【简答题】男女之间通电话结束之时,通常由男士先挂断电话。
【单选题】—There will be a railway in Taizhou soon. —Great! We'll have _____ ways of traveling than before. [ ]
A.
many
B.
much
C.
more
D.
fewer
【单选题】Traveling abroad is much __________ than before.
A.
easy
B.
easier
C.
easiest
D.
the easiest
【简答题】在过盈连接中，当其他条件相同时，仅将实心轴改为空心轴，则连接所能传递的载荷将（ ）。
【单选题】You must have said something to()her, as she was crying after talking with you.
A.
offend
B.
another
C.
and
D.
should
【单选题】Before traveling in space, you must know what it might feel like_____in an imaginary environment.
A.
to travel
B.
traveling
C.
to be traveling
D.
travel
【简答题】Reading comprehension People enjoy traveling a round the world during their holidays. Before traveling to New York, you'd better know the following tips. ★ Arriving in New York There are three airport...
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