A.both of them are ignited by compressed air
B.both of them are the forms of external combustion engines
C.both of them have spark plugs
D.the power is developed by the piston in the cylinder
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A.found out
B.eliminated
C.avoided
D.lowered
A.indicator diagrams
B.nomo-gram
C.temperature readings
D.pressure readings
A.the bad smoke
B.the smoky exhaust
C.the exhaust temperature
D.the peak pressure
A.because
B.though
C.since
D.until
A.polished
B.renewed
C.adjusted
D.ground
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