A certificated lifeboatman assigned to command the lifeboat should().
A. be the first individual to board the craft
B. drain the hydraulic pressure before lowering the craft
C. have a list of the persons assigned to the lifeboat
D. All of the above
查看答案
自动闭塞区段的通过信号机,不应设在停车后可能脱钩或电气化线路过分相的处所,并尽可能不设在起动困难的地点。
A. 正确
B. 错误
按照国际标准,毒品可分为哪几类()
A. 麻醉品
B. 精神药物
C. 其他类
D. A+B+C