Foaming in the steam drum may be caused by （） in a boiler.
The revolving drum of a winch used to haul lines is called a（）.
The cable lifter, mooring drum and warp end of a split windlass may be separately engaged or disengaged means of a （）
When the boiler load returns to normal, the drum pressure will rise and steam bubble formation will reduce, causing a fall in water level This is known as （）.
Which of the following printers includes an imaging drum and fuser assembly?（）
Which of the following printers uses a charged drum to transfer toner to paper？（）
You should frequently compare drum-mounted and remote-reading water level indicators（） between these have contributed to failures because of overheating through shortage of water, when a boiler was being oil-fired.
Foaming in the steam drum may be caused by （） in a boiler.
What is NOT a function of the steam drum of a marine water-tube boiler（）.
（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.
