If a gasoline engine turns over freely but will not start，the cause is generally（）.<br>A:a defective ignition system<br>B:low lube oil level<br>C:weak valve springs<br>D:too heavy a load

If a gasoline engine turns over freely but will not start，the cause is generally（）.
A:a defective ignition system
B:low lube oil level
C:weak valve springs
D:too heavy a load

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