The minimum speed an engine must attain before ignition can occur depends upon （）.<br>A:the type and size of the engine<br>B:the condition of the engine<br>C:ambient temperature<br>D:all of the above

The minimum speed an engine must attain before ignition can occur depends upon （）.
A:the type and size of the engine
B:the condition of the engine
C:ambient temperature
D:all of the above

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