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.<br>A:filled<br>B:evacuated<br>C:compressed<br>D:charged

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

出自：海船船员证

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