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卧式车床进给传动系统中，为何既有光杠又有丝杠来实现刀架的直线运动？可否单独设置丝杠或光杠？为什么？

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卡式接口的弹簧疲劳寿命不应低于（）次。

A. 500.0
B. 800.0
C. 1000.0
D. 1500.0

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昔我往矣，杨柳依依；（）。（诗经・小雅・采薇）

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You are the network administrator for The network consists of a single Active Directory domain named Servers run either Windows 2000 Server or Windows Server 2003. Client computers run either Windows 2000 Professional Service Pack 2 or Windows XP Professional. You need to implement a new software update infrastructure. You discover that security patches, critical updates, and service packs have never been installed on any client computer on the network. You install Software Update Services (SUS) on a Windows Server 2003 computer named Testking5. You must ensure that all client computers receive all Microsoft security patches, critical updates, and service packs. You want to achieve this goal as quickly as possible. Which three actions should you perform? （）(Each correct answer presents part of the solution. Choose three)

A. Install the Automatic Updates client on all Windows 2000 Professional client computers.
B. Install the Automatic Updates client on all Windows XP Professional client computers.
C. Install SUS on a Windows 2000 Server computer.
D. Modify the Windows Update settings of the Default Domain Controller organizational unit (OU) Group Policy object (GPO) to point client computers to http://testking5.
E. Modify the Windows Update settings of the Default Domain Policy Group Policy object (GPO) to point client computers to http://testking5.
F. Upgrade all Windows 2000 Professional client computers to Windows XP Professional.

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为了避免中毒，食品杀菌时必须以（）作为杀菌对象加以考虑。

A. 金黄色葡萄球菌
B. 沙门氏菌
C. 志贺氏菌
D. 肉毒杆菌

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卧式车床进给传动系统中，为何既有光杠又有丝杠来实现刀架的直线运动？ 可否单独设置丝杠或光杠？为什么？

卡式接口的弹簧疲劳寿命不应低于（）次。

昔我往矣，杨柳依依；（）。（诗经・小雅・采薇）

为了避免中毒，食品杀菌时必须以（）作为杀菌对象加以考虑。

卧式车床进给传动系统中，为何既有光杠又有丝杠来实现刀架的直线运动？可否单独设置丝杠或光杠？为什么？