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【单选题】
在由若干机器并联构成的机组中,若这些机器中单机效率相等均为η 0 ,则机组的总效率 η 必有如下关系: 。A.
η ＞ η 0
B.
η ＜ η 0
C.
η ＝ η 0
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举一反三
【单选题】Peter is so careless that he _____ the books on the shelf. [ ]
A.
knocked over
B.
knocked into
C.
turned over
D.
looked through
【单选题】He knocked an old man and knocked him . [ ]
A.
into, into
B.
at, on
C.
down, on
D.
into, down
【单选题】He hurried out and ______the chair.
A.
knocked up
B.
knocked off
C.
knocked back
D.
knocked over
【单选题】He ran so fast that he ________ my cup. How careless he is!
A.
knocked over
B.
put away
C.
knocked on
D.
put up
【单选题】He a glass of milk just now. He was very careless. [ ]
A.
knocked at
B.
knocked on
C.
knocked out
D.
knocked off
【简答题】It seems to dispel the heat and bring on a feeling of__3__.
【简答题】While________(cross) the road, he was knocked over.
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