單項(xiàng)選擇題

A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （）
(1) scavenging air is cooling the exhaust gases
(2) exhaust cycle time is longer

A.(1) only
B.(2) only
C.both (1) and (2)
D.neither (1) nor (2)

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