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金属锐口易割破电缆，可能引发触电或火灾事故如何防止？

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车床工件中主轴要变速时，必须先停车，变换进给箱手柄位置要在低速时进行。

A. 正确
B. 错误

You are the network administrator for The network consists of a sing Active Directory domain named All domain controllers run Windows Server 2003. All client computers run Windows XP Professional with default settings. Some users have portable computers, and the rest have desktop computers. You need to ensure that all users are authenticated by a domain controller whenthey log on. How should you modify the local security policy?（）

A. Require authentication by a domain controller to unlock the client computer.
B. Cache zero interactive logons.
Cache 50 interactive logons.
D. Grant the Log on locally user right to the Users group.

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电除尘器的漏风率应小于（）%。

A. 1
B. 2
C. 3
D. 5

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根据《商业银行法》，商业银行可以经营下列业务（）。

A. 吸收公众存款
B. 发放短期、中期和长期贷款
C. 办理票据承兑与贴现
D. 代理发行、代理兑付、承销政府债券
E. 买卖、代理买卖外汇

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