问题
单项选择题
he heel block is located（）.
A.at the base of the boom
B.at the cargo hook
C.near the midships guy
D.near the spider band
答案
参考答案：A
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he heel block is located（）.
A.at the base of the boom
B.at the cargo hook
C.near the midships guy
D.near the spider band
参考答案：A
