单项选择题

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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单项选择题
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
单项选择题
A condenser is a vessel in which（） is deprived of its latent heat of vaporization and so changed to its liquid state.

A.sea water
B.fresh water
C.vapour
D.gas
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