derrick boom
... derrick block 提升滑轮 derrick boom 起货吊杆 derrick brace 井架斜撑 ...
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全旋转吊杆起货设备 full rotating derrick
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开舱盖的方法不令人满意，起货设备传动轮弯头在开舱时不穿过吊杆，原因为使用吊杆不安全。
The opening hatch cover method also not to be satisfied that using the warping head of cargo gear not through derrick boom open the hatch cover because using derrick boom is not safe.
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