2010年7月1日,()城际高速铁路正式投入运营。它目前我国乃至世界上标准最高、里程

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问题:

2010年7月1日,()城际高速铁路正式投入运营。它目前我国乃至世界上标准最高、里程最长、运营速度最快的城际高速铁路。

A、沪宁;

B、京津;

C、哈大;

D、郑西

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设f(x)存在二阶连续导数,且满足xf″(x)+3x[f′(x)]2=1-e-x,又x0为驻点,则()。

A.f(x0)为f(x)的极大值

B.f(x0)为f(x)的极小值

C.(x0,f(x0))为f(x)的拐点

D.f(x0)非极值,(x0,f(x0))也非拐点

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It is known to all that nothing is much precious than time. A famous saying goes, “Time is money”, which shows that time is invaluable. When time is gone, it will never return back. But it is pity that some people didn’t make full use of their time. They spend a lot of time sleep, chatting or playing computer game. They don’t realize that wasting time is actual equal to killing themselves. We always regret not having made great achievements. However, to be successful, they should first form the habit of being on time. Don’t put down what can be done today until tomorrow. Being lazy will eventually lead to failure.

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EAD解决方案通过和设备配合,调用设备上的()等资源,实现对不同用户进行不同的操作,将终端管理控制在网络接入的第一步。

A.MAC

B.ACL

C.IP

D.VLAN

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生产经营单位必须为从业人员提供符合()劳动防护用品,并监督、教育从业人员按照使用规则佩戴、使用。

A.国家标准或者行业标准的

B.安全生产监督管理的部门规定的

C.国务院有关部门规定的

D.市级以上各级人民政府及其有关部门规定的

题型:单项选择题

容量()K·VA及以上的油浸式配电变压器应装设气体继电器。

A.315

B.500

C.800

D.1000

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