A sheave is a（）.<br>A:grooved wheel in a block<br>B:line to hold a lifeboat next to the embarkation deck<br>C:partial load of grain<br>D:seaman's knife

A sheave is a（）.
A:grooved wheel in a block
B:line to hold a lifeboat next to the embarkation deck
C:partial load of grain
D:seaman's knife

出自：海船船员证

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