下列说法正确的是

推高功率之前，发动机在慢车运转3分钟作为暖车，冬季需暖车5分钟

关车前发动机必须在慢车位运转3分钟来使热部件达到热稳定

高功率试车之后应保证慢车位运转5分钟冷车时间。

以上都是

正确答案：D

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