单项选择题
A.Sub-cooled liquid B.Sub-cooled vapor C.Superheated vapor D.Liquid
Flame failure in an automatically fired auxiliary boile...
单项选择题Flame failure in an automatically fired auxiliary boiler can from a/an （）
A.incorrect electrode setting B.incorrect nozzle position C.clogged fuel nozzle D.broken high tension lead
Cold weather starting of a diesel engine may be made ea...
单项选择题Cold weather starting of a diesel engine may be made easier by（）
A.decreasing the compression ratio B.using a special fuel having a high ignition temperature C.increasing the starting air supply D.heating the jacket water
Diesel engine air start system check valves are opened ...
单项选择题Diesel engine air start system check valves are opened by （）
A.an air start cam B.cylinder compression pressure C.starting air pressure D.valve springs
