问题
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An internal bypass is provided on some hydraulic system suction strainers to help reduce the possibility of _____.
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Because of the reduced _____ in the vacuum boiling evaporator, some of the sea water boils
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Some in the market now want government _____ in order to reduce costs.
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In some cities of North China, the noise pollution is as pronounced as that in Tokyo.A.con
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What is the first thing that people ought to do in face of pollution, according to the aut
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What is the purpose of the author in writing the passage?A.To call on people to reduce car
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