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问题

Before liquid can flow into a pump, the air in the suction line must be _____ sufficiently


Before liquid can flow into a pump, the air in the suction line must be _____ sufficiently to cause the liquid to flow into the suction chamber.

A.filled

B.evacuated

C.compressed

D.charged

请帮忙给出正确答案和分析,谢谢!

参考答案
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