A.a fire -tube boiler
B.an internal combustion engine
C.an external combustion engine
D.an internal combustion generator
第1题
A.after the thrust power is zero
B.after the torsion is zero
C.surpass the critical point on the water turbo phase
D.after the speed is zero
第2题
A.brushes on a commutator
B.brushes on slip rings
C.slip rings on a commutator
D.direct connections from the stator
第3题
A.two knock
B.three knocks
C.four knocks
D.five knocks
第4题
A.either all the way open or all the way closed
B.normally fully open
C.throttled depending on load
D.controlled by liquefied pressure
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