船上至少应有___救生圈配备电池式自亮浮灯一只
A1/2
B1/3
C1/4
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空气管下口设置于各油水舱()角落的内底板下:
A. 前部
B. 中部
C. 后部
D. 下部
During loading or discharging,the tallymen must make contact with______on duty so as to solve problems in time.
A. ship owner
B. ship’s officers
Consignors
D. shippers