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简述模塑料?

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下面说法错误的是()。

A. 理想大地对天线性能的影响不可忽略
B. 理想大地对水平天线和垂直天线的影响不同
C. 大地会对天线阻抗产生影响
D. 若地表非常粗糙,则不能忽略地面反射波

喷油泵柱塞的有效行程()柱塞行程。

A. 大于
B. 小于
C. 大于等于
D. 小于等于

点焊焊件表面必须清洗,去除氧化膜、泥垢等才能焊接。

A. 正确
B. 错误

You are designing a Windows Azure web application. All users authenticate by using their Active Directory Domain Services (AD DS) credentials. You need to recommend an approach for enabling single sign-on for domain-authenticated users. Which two actions should you recommend?()

A. Use Forms authenticationto generate claims.
B. Use Active Directory Federation Services (AD FS) to generate claims.
C. Use SqlMembershipProvider in the web application.
D. Use Windows Identity Foundation in the web application.

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