單項選擇題Distilled water is now largely used on board, this may be corrosive (due to presence of dissolves CO2) and () to the taste.

A.flat
B.slat
C.sweet
D.acid


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2.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

3.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

5.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