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【单选题】
According to the passage, why was the Labour Party established in Britain?A.
Because the trade unions did not do much good for the working people.
B.
Because the Liberal Party were not strong enough to defeat the Conservative Party.
C.
Because the working people would not like to be members outside the Liberal Party.
D.
Because neither of the two major parties was the parties for the working people.
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反馈参考答案：
举一反三
【单选题】Moisture is removed from a refrigeration system by
A.
bleeding refrigerant from the condenser
B.
opening a drain petcock on the oil separator
C.
condensing the water in the heat exchanger
D.
using a dehydrator cartridge
【简答题】为什么要清洗氟电极,使其响应电位值负于 320 mV ?
【单选题】Low compressor head pressure in a refrigeration system can be caused by（）.
A.
insufficient condenser cooling water
B.
excessive condenser cooling water
C.
air in the refrigeration system
D.
excessive refrigerant in the system
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