单项选择题
In order to reduce the accumulation of static electricity while loading petroleum products, you should（）.
A.start to load at maximum pressure B.start to load slowly C.increase the air flow into the tank D.use the overall method of loading only
单项选择题 In ship construction, frame spacing is（）.
单项选择题 In the absence of external forces, adding weight on one side of a floating vessel causes the vessel to（）.
单项选择题 In the absence of external forces, the center of buoyancy of an inclined vessel is vertically aligned directly below the（）.
