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周惠王去世，周襄王为什么不发丧？

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钢筋锥螺纹连接的主要优点是（）

A. 受气候影响大
B. 施工速度慢
C. 施工速度快
D. 受气候影小
E. 应用范围广

You have an Exchange Server 2010 organization named Contoso.com that contains a mail-enabled Domain Local group named Group1.Users from outside the organization report that all e-mail messages sent to group1@contoso.com generate a non-delivery-report （NDR）.You need to ensure that users from outside the organization send e-mail to group1@contoso.com. What should you modify for group1？（）

Advanced settings
B. Group scope
C. Group type
D. The mail flow setting

液化石油气的来源？

在富氧区域动火，氧含量不得大于（）。

A. 23％
B. 23.5％
C. 25％
D. 25.5％