A. 20 B. 50 C. 100 D. 200
A. 正确 B. 错误
A. 2 B. 3 C. 4 D. 5
A. the forced ventilating system is operating B. the cargo pumps are secured C. no monocarbon gases are present D. the oily water separator is de-energized
A. 辅助调查 B. 间接调查 C. 侧面调查 D. 实地查看