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A Windows Communication Foundation (WCF) solution uses two services to manage a shopping cart. Service A processes messages containing line items that total between $0 and $500. Service B processes messages containing line items that total more than $500. All messages are of equal importance to the business logic. You need to route incoming messages to the appropriate services by using WCF routing. Which two message filters should you add to the router? (Each correct answer presents part of the solution. Choose two.)（）

A. a message filter with a priority of 100 that will forward messages that total between $0 and $500 to Service A
B. a message filter with a priority of 0 that will forward messages that total between $0 and $500 to Service A
C. a message filter with a priority of 0 that will forward all messages to Service B
D. a message filter with a priority of 100 that will forward all messages to Service B

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简述标高传递的操作方法。

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电对人体会产生怎样的危害？

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《公文处理系统》中通过文件跟踪，可以了解文件的运转情况。在〖对象〗菜单中，选〖文件跟踪〗，屏幕会出现‘公文流程’框，显示该文件各次发送的（）

A. 寄出时间
B. 寄件人
C. 收件时间
D. 收件人

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