On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.<br>A:hydraulic<br>B:electric<br>C:steam<br>D:diesel

On tank vessels equipped with power operated cargo tank valves, the type of power operator most commonly used is （）.
A:hydraulic
B:electric
C:steam
D:diesel

出自：海船船员证

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