问题
单项选择题
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
答案
参考答案：A
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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
参考答案：A