单项选择题
What is NOT a responsibility of the tankerman in charge of loading an unmanned tank barge? （）
A.Enforcement of smoking restrictions B.Restricting vessels from coming alongside the barge C.Insuring that a combustible gas indicator is aboard D.Protecting cargo hose with chafing gear
单项选择题 What is NOT a precaution to be taken when topping off? （）
单项选择题 What is an example of the term Restraint of Rulers，Princes，or Peoples in a marine insurance policy? （）
单项选择题 What is a characteristic of all centrifugal cargo pumps? （）
