第七章测试1.1.For an engine to make the best use of the fuel, the spark should occur before the piston reaches the top of（ ）。
A:the exhaust stroke
B:the intake stroke
C:the compress stroke
D:the compression stroke
答案:D
2.The piston speed increases as the engine speed increases. This means that the faster the engine goes, the spark has to occur（ ）。
A:earlier
B:uncertain
C:no change is necessary
D:later
3.According to your understanding, retarding the timing may also eliminate（ ）。
A:ignition
B:combustion
C:knocking
D:compression
4.The primary role of the distributor is to distribute high voltage from the（ ）to the correct cylinder.
A:rotor
B:coil
C:spark plug
D:piston
5.Functions of ignition system are （ ）
A:ignite the mixture piston
B:control the timing of spark
C:send spark to correct cylinder
D:create a spark
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