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AZY30压缩氧自救器是如何使用的？

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乙醇汽油是用（）的普通汽油与（）的燃料乙醇调和而成。

A. 60%；40%
B. 80%；20%
C. 90%；10%
D. 70%；30%

You have an Active Directory domain named contoso.com.You have an Exchange Server 2010 organization that contains a Client Access server named CAS1.Users connect to CAS1 from the Internet by using mail.contoso.com.The organization contains the following mobile clients：（1）Windows Mobile 5.0 （2）Windows Mobile 6.1 （3）Windows Mobile 6.5 You plan to install a certificate on CAS1.You need to ensure that all clients can connect to CAS1 from the Internet by using Exchange ActiveSync.Which name should you include in the certificate？（）

A. contoso.com
B. CAS1.contoso.com
C. EAcontoso.com
D. mail.contoso.com

水泥土防渗层的裂缝可沿缝凿成倒三角形或倒梯形，不需清洗干净。

A. 正确
B. 错误

加氢反应器在停工过程中冷却不能太快，是为了防止反应器发生（）。

A. 高温氢腐蚀
B. 氢脆
C. 氢致剥离
D. 回火脆性破坏