During the stable operation of the NECOL5000-A35KW air conditioner compressor, the oil level that can be observed by the sight glass is considered qualified at the position of ().

During the stable operation of the NECOL5000-A35KW air conditioner compressor, the oil level that can be observed by the sight glass is considered qualified at the position of ().
A . 0-14
B . 1/4-1/2
C . 1/3-1
D . ＞ 1

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Answer: C