你可能感興趣的試題

單項(xiàng)選擇題

Which of the following items is necessary for all waste heat boiler installations, regardless of design or manufacturer? （）

A.Control of evaporation
B.A separate means to prevent feed-water contamination
C.Power circulating pump
D.Super-heater

單項(xiàng)選擇題

Prior to lighting off a cold automatically fired auxiliary boiler, yon should （）.

A.check and regulate the water level
B.close the air cock once fires are lit
C.blowdown the gage glass
D.crack the steam stop to assure protective steam flow

When a hydraulic vane pump is working, which of the following is in contact with the vanes?（） (1) the rotor (2) the internal surface of the housing (3) the external surface of the housing

你可能感興趣的試題

Which of the following items is necessary for all waste heat boiler installations, regardless of design or manufacturer? （）

Prior to lighting off a cold automatically fired auxiliary boiler, yon should （）.

When a hydraulic vane pump is working, which of the following is in contact with the vanes?（）
(1) the rotor
(2) the internal surface of the housing
(3) the external surface of the housing