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
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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
按器材搬运安全作业的要求,人工卸车()把光缆盘从车上直接推下。
A. 可以
B. 严禁
C. 用木棒
D. 用铁撬