单项选择题
They should take care of（锚）（）to ensure that they are in normal condition.
A. anchors B. anchor ball C. anchor gear D. anchor ring
单项选择题 Take down （）(G旗).
单项选择题 A （）(救生圈) should be located on the gangway.
单项选择题 The gangway is going to hit the （）(系缆桩) on the wharf.
