单项选择题
A.be increased B.be decreased C.remain constant D.either be increased or remain constant
Water evaporates or steam condenses at the saturation t...
单项选择题Water evaporates or steam condenses at the saturation temperature, which depends upon the pressure, the higher the pressure （） the saturation temperature.
A.the more B.the higher C.the lower D.the highest
A （） boiler is an auxiliary boiler sometimes included i...
单项选择题A （） boiler is an auxiliary boiler sometimes included in a steamships installation for supplying steam to auxiliaries in port.
A.monkey B.donkey C.waste heat D.main
Between the steam dram and the smaller water dram below...
单项选择题Between the steam dram and the smaller water dram below, large numbers of smaller diameter （） tubes are fitted.
A.fire B.water wall C.generating D.down comer
