Before charging a refrigeration unit, the refrigerant charging lines should be（）<br>A:flushed with clean refrigerant oil<br>B:purged with the refrigerant<br>C:washed with an ammonia and alcohol solution<br>D:grounded to compressor

Before charging a refrigeration unit, the refrigerant charging lines should be（）
A:flushed with clean refrigerant oil
B:purged with the refrigerant
C:washed with an ammonia and alcohol solution
D:grounded to compressor

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