单项选择题
Check （）(危险区) and report , please.
A. danger area B. safety area C. danger room D. safety room
单项选择题 They should take care of the （系泊缆绳）（）.
单项选择题 Pay attention to the （）（安全）of the gangway.
单项选择题 If our captain is not in his cabin, he must be on the（驾驶台）（）.
