题目内容

火管锅炉

A. Water-tube boiler.
B. Fire-tube boiler.
C. Exhaust boiler.
D. Composite boiler.

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更多问题

锅炉

A. Boilers.
B. Water-tube boiler.
C. Fire-tube boiler.
D. Steam.

水管锅炉

A. Fire-tube boiler.
B. Water-tube boiler.
C. Exhaust boiler.
D. Scotch boiler

电焊机

A welding machine.
B. A drilling machine.
C. A grinding machine.
D. A cutting machine.

切割机

A welding machine.
B. A drilling machine.
C. A grinding machine.
D. A cutting machine.