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【单选题】
不会使活塞式制冷压缩机输气系数降低的是 。A.
吸人滤器脏堵
B.
冷凝器冷却水温升高
C.
缸头弹簧太强
D.
气阀弹簧太强
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反馈参考答案：
举一反三
【单选题】This actually makes it harder to dress appropriately, but fortunately most offices also（）a few signals.
A.
send for
B.
send off
C.
send up
D.
send out
【判断题】Most offices also have a kitchen, where their employees can refresh themselves with cups of coffee or tea and have a break.
A.
正确
B.
错误
【单选题】Because of the complexity of the modern machine, most offices require secretaries ______.
A.
to have specified training
B.
specified in training
C.
to train specifiedly
D.
training specified
【单选题】While skyscraper offices and elegant apartment blocks remain the public face of most major cities, these cities also have a mass of secret tunnels and hidden pipes below______which keep everything wor...
A.
land
B.
ground
C.
soil
D.
earth
【单选题】Because of the complexity of the modern machine, most offices require secretaries ________.
A.
to have specified training
B.
specified in traing
C.
to train specifiedly
D.
training specified
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