What is not a difference between VPN tunnel authentication and per-user authentication?（）
A. VPN tunnel authentication is part of the IKE specification.
B. VPN tunnel authentication does not control which end user can use the IPSec SA (VPN tunnel).
C. User authentication is used to control access for a specific user ID, and can be used with or without a VPN tunnel for network access authorization.
D. 802.1X with EAP-TLS (509 certificates) can be used to authenticate an IPSec tunnel.
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采用磷化铝粮面投药时，考虑到磷化铝吸湿潮解较慢，施药后8－10h以后开始定时环流。
A. 正确
B. 错误
患者，女，20岁。自幼咳嗽，经常于感冒后加重，咯大量脓痰，无咯血，考虑诊断为（）
A. 慢性支气管炎
B. 慢性肺脓肿
C. 支气管扩张症
D. 先天性支气管囊肿
E. 肺气肿继发感染
掘进机液压系统做耐压试验时，当系统压力小于16MPa时，试验压力为额定压力的（）倍。
A. 1.2
B. 1.5
C. 2
D. 3
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