在检修或处理事故期间，信号工、把钩工应负责保卫井口周围（）m以内不准无关人员逗留，或进行其他作业等。
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钢筋加工弯起钢筋的弯折位置允许偏差（）。
A. ±5mm
B. ±10mm
C. ±15mm
D. ±20mm
The rule state that a vessel overtaking another vessel is relieved of her duty to keep clear when（）.
A. she is forward of the other vessel’s beam
B. the overtaking situation become crossing situation
C. She is past and clear of the other vessel
D. the other vessel is no longer in sight
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