AWhen the derrick is stopped, the guy must be stowed.
BWhen the derrick is stopped, the guy must be topped.
CWhen the derrick is stopped, the guy must be lowered.
DWhen the guy is stopped, the derrick must be stowed.
船舶离港之前,所有的吊杆必须纵向收放好。()
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The ()(侧稳索) has gone wrong.
Renew the ()(稳索), please.
不要随意地移动稳索。()
Adjust the ()(中心稳索), please.
双吊杆布置时应满足一定要求,其中一项是当吊钩起升高度达到安全极限时两根吊货索夹角应小于:()
水手应该知道船上吊杆的安全工作负荷。()
The ()(吊杆托架) supports the derrick.
我们每航次拆卸一次吊杆。()
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