If the suction pressure at the refrigeration compressor is b

【名词&注释】

二氧化碳

[单选题]If the suction pressure at the refrigeration compressor is below normal, the cause can be

A. refrigerant overcharge
B. overfeeding by the expansion valve
C. a restricted suction strainer
D. due to short cycling of the compress

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举一反三：

[单选题]包扎伤口的目的是______。

A. 保护伤口,减少污染
B. 固定骨折部位
C. 帮助止血
D. 以上都是

[单选题]启动二氧化碳系统前应：

A. 切断电源
B. 停车
C. 示警
D. 通风

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