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【单选题】
某大楼采用了20个变风量空调系统，每个系统的空调机组出口余压均为650Pa。对其风管系统安装的严密性检验要求，下列哪一项是符合规范规定的?
A.
可不进行风管系统的严密性检验
B.
可采用漏光法进行风管系统的严密性检验，且抽检数量不低于1个系统
C.
首先风管系统采用漏光法检验，检验合格后，在进行漏风量测试，测试的抽检数量不 少于4个系统
D.
必须对20个系统分别进行漏风量测试
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