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单选题
如果发现通气管中的空气量不正确，做一个系统测试。
A
If you find an incorrect quantity of air from the vent mast, do a system test.
B
A system test should be conducted once you find an abnormal airflow from the vent mast.
C
It is necessary to do a system test after you find the air quality in the vent mast is improper.
答案解析
正确答案：A
相关知识点：
通气管空气量不对，做系统测试
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