将部件、组件、零件联接组合成为整台机器的操作过程称为()
A. 零件装配
B. 组件装配
C. 部件装配
D. 总装配
金属探测门应配有声音报警信号调节装置,可以调节持续()。
A. 时间
B. 音调
C. 音量
D. 以上都对
氨制冷系统管道焊接时,小的焊缝必须一次焊接完成,一些相对较大的焊缝可以根据实际情况分几次焊接完成。
A. 正确
B. 错误
At the required fire drill conducted aboard a vessel, all person must report to their stations and demonstrate their ability to perform the duties assigned to them().
A. by the toolpusher
B. in the station bill
C. by the person conduction the drill
D. at the previous safety meeting