英语词汇derrick boom简单造句、意思、用法及例句-英语例句辞典

单词	derrick boom
例句	原声例句航海英语听力 Chief officer: the derrick boom on hatch no. 1 is not safe , and it may be harmful for navigation , second , could you check it tomorrow? 一舱吊杆不安全，可能影响安全航行。二副，你明天检查一下。航海英语听力 20.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. 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。
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