A、the former
B、the first
C、the latter
D、the last
更多“The steam boiler is part of a closed loop steam, whereby, after the energy of the steam is used up and it becomes water again, （） is collected and returned back to the boiler for heating up again to steam.”相关的问题
A、drop as the boiler warms up B、rise as the boiler warms up C、remain unchanged until the boiler is hot enough D、rise and fall with the steam demand
A、ensure feed water flow into the boiler B、keep the steam drum pressure high C、prevent water hammer in the feed line D、help the feed water flash to steam
A、Receives saturated steam from the generating tubes B、Serves as a reservoir of boiler feed water C、Holds internal fittings for separation of moisture from steam D、Collects steam exhausted from the turbines
A、A.rise when the steam pressure is increased B、B.remain constant as long as the feed pump operates C、C.fall when the steam pressure is decreased D、D.vary as the steam demand changes
A、boiler water level is low B、feedwater is too hot C、boiler steam demand is low D、feedwater is too cold
A、natural circulation of the water in the water tube boiler is better than that in the fire tube boiler B、for the same output the water tube boiler will carry less mass of water compared with the fire tube boiler C、the water tube boiler will cost shorter time for steam raising D、the water tube boiler require lower skill in operating and maintaining
A、salinity is abnormally high B、steam demand is too high C、water level is abnormally low D、feedwater flow is low
A、high steam pressure in the boiler B、abnormally high feed water temperature C、abnormally high boiler water temperature D、steam demand exceeding feed pump capacity
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