The most important principle of the cargo stowage is（）.
A. to avoid the rearrangement of the cargo loaded on board
B. to ensure the safety of the ship and cargo
C. to reject the damaged cargo during loading operation
D. to prevent the spontaneous combustion of coal and grai
被认为是鱼类的祖先的鱼是（）
A. 弹涂鱼
B. 总鳍鱼
C. 大弹涂鱼
D. 青弹涂鱼
Sweating of the refrigeration system compressor crankcase is caused by （）.
A. too much superheat
B. insufficient superheat
C. suction pressure too low
D. excessive refrigerant returning to the compressor
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