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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相关考题
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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 -
单项选择题
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
