A300

?8536.When servicing an air-conditioning system that has lost all of its freon, it is necessary to

发布于 2021-02-18 22:11:38

【单选题】
A ?check oil and add as necessary, evacuate the system, relieve vacuum, and add freon.
B ?check oil and add as necessary, evacuate the system, and add freon.
C ?check oil and add as necessary, and add freon.

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