單項(xiàng)選擇題

Soot blowers should be used in proper sequence so that（）

A.excess stresses will not be set up in the boiler
B.the decks will not be covered with soot
C.the soot will be swept toward the uptakes
D.there will not be a loss of steam pressure

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單項(xiàng)選擇題

The valve that prevents water from backing out of the boiler into the feed line is the（）.

A.bottom-blow valve
B.skin valve
C.feed-check valve
D.feed-stop valve

單項(xiàng)選擇題

The mechanical exhaust valve operation system is replaced by（）in an electronic controlled ME engine.

A.a system with a Hydraulic Power Supply (HPS) unit
B.a system with roller guides for exhaust valves
C.a system with an electronically controlled Alpha Lubricator
D.a system directly powered by electric motor