單項選擇題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


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1.單項選擇題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

3.單項選擇題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

5.單項選擇題A non-return valve in the air delivery line near to the compressor must be ()type similar to the compressor discharge valve.

A.the low inertia
B.the high inertia
C.the low velocity
D.the high velocity