In general, domestic flesh water tank kept under pressure by an external supply of （）.<br>A:forced circulating pump<br>B:compressed air<br>C:gravity tank<br>D:bead tank

In general, domestic flesh water tank kept under pressure by an external supply of （）.
A:forced circulating pump
B:compressed air
C:gravity tank
D:bead tank

出自：海船船员证

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