單項(xiàng)選擇題The domestic fresh water pump starters are controlled by pressure switches which operate when the pressure in the tank varies within predetermined limits as water is drawn offThe word “which” means ().

A.starters
B.pressure switches
C.pressure
D.water


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1.單項(xiàng)選擇題In general, domestic flesh water tank kept under pressure by an external supply of ().

A.forced circulating pump
B.compressed air
C.gravity tank
D.bead tank

2.單項(xiàng)選擇題The abbreviation "TDS" about the potable water probably means ().

A.total dissolved solids
B.temperature of distillation of sea water
C.total dissolved sodium
D.total delivery system

4.單項(xiàng)選擇題In more recent years, () heat exchangers have frequently been employed for jacket water and oil cooling.

A.shell and tube type
B.plate type
C.coil type
D.conical disc type

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