题目内容

变频器的干扰主要包括有（）两部分。

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试述现代企业工资制度的特征或内容。

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.
C. On the client, create a proxy derived from DuplexClientBase.
D. On the client, use GetCallbackChannel.

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何谓环境承载力？

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溃疡性结肠炎患者腹痛的规律是（）。

A. 无明显规律性
B. 疼痛-排便加重
C. 进食-疼痛-缓解
D. 疼痛-进食-缓解
E. 疼痛-排便-缓解

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