单项选择题

What is the female section of a tool joint called? （）

A.Stem
B.Pin
C.Box
D.Stand

点击查看答案&解析

上一题目录下一题

单项选择题

A.An oxygen indicator
B.A combustible gas indicator
C.A combination combustible gas and oxygen indicator
D.A flame safety lamp

单项选择题

A.Carbon dioxide
B.Distilled water
C.Fresh water
D.Salt water

单项选择题

A.keep ports，doors，windows，and hatches closed
B.start engines immediately
C.ventilate before starting engine
D.None of the above