单项选择题 It is possible,and sometimes necessary, to strengthen the deck of a vessel for carriage of deck cargo by（）.

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.

单项选择题 Keeping certain crgoes separated because of the their inherent characteristics is known a（）.