In order to ensure perfect atomization, the fuel oil （） before injection.<br>A:has to be cooled<br>B:has heated<br>C:has preheated<br>D:has to be preheated

In order to ensure perfect atomization, the fuel oil （） before injection.
A:has to be cooled
B:has heated
C:has preheated
D:has to be preheated

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