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

汽油、石脑油、柴油、燃料油等为（）。

A、气体类油品

B、燃料类油品

C、溶剂类油品