As the plunger moves upwards in the barrel, injection will commence once the plunger has （） the spill ports and the pressure builds up.<br>A:opened up<br>B:closed off<br>C:lined up<br>D:taken off

As the plunger moves upwards in the barrel, injection will commence once the plunger has （） the spill ports and the pressure builds up.
A:opened up
B:closed off
C:lined up
D:taken off

出自：海船船员证

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