When the Huawei air-cooled air-conditioning compressor is turned on for the first time, the crankcase heating belt needs to be preheated for more than () hours.

When the Huawei air-cooled air-conditioning compressor is turned on for the first time, the crankcase heating belt needs to be preheated for more than () hours.
A . 2
B . 6
C . 12
D . 24

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Answer: C