县级以上卫生行政部门应当组织对公共场所的健康危害因素进行监测、分析的目的是（）
A. 为制定法律法规提供科学依据
B. 为制定卫生标准提供科学依据
C. 为实施监督管理提供科学依据
D. 提高监管力度
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Why is NTP an important component when implementing IPSec VPN in a PKI environment？（）
A. To ensure the router has the correct time when generating its private/public key pairs.
B. To ensure the router has the correct time when checking certificate validity from the remote peers
C. To ensure the router time is sync with the remote peers for encryption keys generation
D. To ensure the router time is sync with the remote peers during theDH exchange
E. To ensure the router time is sync with the remote peers when generating the cookies during IKE phase 1
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