在换热器的设计计算时，传热系数的修正值应怎样选取？
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屠宰检疫规程规定，屠宰动物宰前检查是什么时候进行？
酸气经过回收装置使宝贵资源得到综合利用，又防止了大气污染。
A. 正确
B. 错误
下列有关偶然误差的叙述是否有不正确的（）
A. 偶然误差具有随机性
B. 偶然误差的数值大小、正负出现的机会是均等的
C. 偶然误差在分析中是不可避免的
D. 偶然误差是由一些不确定的偶然因素造成的
E. 以上叙述没有正确的
A Windows Communication Foundation （WCF） service has a callback contract. You are developing a client application that will call this service. You must ensure that the client application can interact with the WCF service. What should you do？ （）
A. On the OperationContractAttribute， set the AsyncPattern property value to True.
B. On the OperationContractAttribute， set the ReplyAction property value to the endpoint address of the client. For interactive and self-paced preparation of exam 70-513， try our practice exams. Practice exams also include self assessment and reporting features!
C. On the client， create a proxy derived from DuplexClientBase（Of TChannel）.
D. On the client， use GetCallbackChannel（Of T）.
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