单项选择题
A person referring to the stern sheets of a lifeboat is speaking of（）.
A.the line attached to the tack of the lugsail B.the emergency rudder C.a canvas awning D.the aftermost seating
单项选择题 （）is used for heaving up and slacking away the anchor and chain.
单项选择题 Frapping lines are fitted to lifeboat davits to（）.
单项选择题 If you hear more than six short blasts and one long blast of the whistle supplemented by the same signal on the general alarm，you should（）.
