单项选择题
It should be noted（）the use of synthetic mooring ropes able to produce sparks by their manipulation is absolutely forbidden on board petroleum tankers and LPG or LNG carriers，or any vessels carrying inflammable substances.
A.that B.which C.who D.these
单项选择题 If you have a liquefied flammable gas barge in tow，which is NOT required of you with respect to the barge and its cargo? （）
单项选择题 Gasoline vapor tends to collect（）.
单项选择题 Gasoline tanks should be filled（）.
