Spreading oil on the open sea has the effect of ______．
A. Diminishing the height of the seas
B. Lengthening the distance between successive crests
C. Increasing the height of the seas
D. Preventing the wave crests from breaking
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担任农村信用和县级农村信用联社理事长、副理事长、主任、副主任，分别应具备的学历、专业工作年限？
The free surface effects of a partially full liquid tank decrease with increased ______．
A. Density of the liquid
B. Placement of the tank above the keel
C. Displacement volume of the ship
D. Size of the surface area in the tank
Since lubricating oils and jet fuels are acutely water critical，it is necessary to effect
A. purging with hydrocarbon gas
B. gas-freeing operations
C. maintaining an inert condition
D. full line draining and mopping up of any water
Sulfuric acid is a ______．
A. Clear syrupy liquid with no odor
B. Colorless-to-brown liquid with a choking odor when hot
Colorless liquid with a pleasant fruity odor
D. Whitish liquid with a faint，pleasant odor
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