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【单选题】
下列低压侧加注制冷剂的步骤,正确的先后顺序是( ) 。 1 拧管压力计的中间接头,看到白气冒出时立即拧紧; 2 先顺时针方向转动注入阀旋转手柄,使针阀扎破罐口,再逆时针转动手柄,抬起阀针; 3 抽完真空后,关闭高低压手动阀,将中间接头的软管从真空泵改接到制冷剂罐; 4 启动发动机,启动空调系统,打开低压手动阀,开始加注。
A.
2-4-1-3
B.
3-2-1-4
C.
4-3-2-1
D.
1-3-4-2
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