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 vessel carrying inflammable substances.
A.that B.which C.who D.these
单项选择题 Keeping certain crgoes separated because of the their inherent characteristics is known a（）.
单项选择题 Limber is a term associated with（）.
单项选择题 Litmus paste is used in order to determine（）.
