How many adult life jackets are required on board a ship?()
A. Enough for 100 percent of the persons allowed on board
B. One for each work station and industrial work site
C. Enough for 150 percent of the persons allowed on board
D. Both A and B above
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()是各项业务核算的基础。
A. 各项业务核算手续
B. 基本核算方法
C. 账薄
D. 账务组织
斜井箕斗是专门用于斜井提升()的装备。
A. 人员
B. 物料
C. 设备
D. 煤炭