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标准齿轮（）圆上的压力角为标准值，其大小等于（）。

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采购订单界面中外币未税、外币税额、外币含税之间的关系为（）

A. 外币含税=外币税额+外币未税
B. 外币税额=外币含税+外币未税
C. 外币未税=外币税额+外币含税

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用来表征生产设备或过程运行是否正常而需要加以控制的物理量是（）

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You are the network administrator for The network consists of an internal network and a perimeter network. The internal network is protected by a firewall. The perimeter network is exposed to the Internet. You are deploying 10 Windows Server 2003 computers as Web servers. The servers will be located in the perimeter network. The servers will host only publicly available Web pages. You want to reduce the possibility that users can gain unauthorized access to the servers. You are concerned that a user will probe the Web servers and find ports or services to attack. What should you do?（）

A. Disable File and Printer Sharing on the servers.
B. Disable the IIS Admin service on the servers.
C. Enable Server Message Block (SMB) signing on the servers.
D. Assign the Secure Server (Require Security) IPSec policy to the servers.

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谷疸之为病寒热不食，（），心胸不安，久久发黄为谷疸，（）主之。

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