Diesel engines are considered safer than gasoline engines because（）.<br>A:they are more heavily built<br>B:the fuel used is less volatile<br>C:they can be easily reversed<br>D:they operate at a lower speed

Diesel engines are considered safer than gasoline engines because（）.
A:they are more heavily built
B:the fuel used is less volatile
C:they can be easily reversed
D:they operate at a lower speed

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