汽机运行中影响轴向推力的因素很多,但基本上轴向推力的大小与蒸汽流量大小()。
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If a ship is proceeding towards the magnetic equator,the uncorrected deviation due to permanent magnetism().
A. increases
B. remains the same
C. decreases
D. is unimportant and may be neglected
控制和改变不良行为习惯不包括()
A. 吸烟
B. 滥用药物
C. 娱乐
D. 嗜赌
E. 酗酒