Compressed air is supplied by air compression to _____.
A.the air receivers
B.the starting valves
C.the cylinder covers
D.the distributors
第1题
A.I only
B.II only
C.both I and II
D.neither I nor II
第2题
A.excessive ring action
B.excessive ring temperature
C.improper ring rotation
D.excessive ring face wear
第3题
A.Dehydrators must be used continuously in a refrigeration system
B.A 25 ton refrigeration system has the same cooling effect as melting 25 tons of ice in 24 hours
C.A thermostatic expansion valve is used to control refrigerated space temperature
D.The liquid receiver functions to collect and remove non- condensable gases
第4题
A.field excitation of both units is adjusted
B.governors of both units are adjusted
C.phase sequence is altered
D.kilowatt load is evenly divided
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