关于函数的单调性,下列说法正确的是( ) A.f(x)=x2+1是增函数 B.f(x

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问题:

关于函数的单调性,下列说法正确的是(  )
A.f(x)=x2+1是增函数
B.f(x)=x2+1在(-∞,-5)上是减函数
C.f(x)=
1
x
在R上是减函数
D.f(x)=x2+1在(-5,+∞)上是增函数
考点:函数的单调性、最值
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已知曲线C1

x=2+t
y=-t
(t为参数),则C1与C2(  )

A.没有公共点
B.有一个公共点
C.有两个公共点
D.有两个以上的公共点
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The air we breathe is freely available, without    小题1:  we could not survive more than a few minutes. For the most part, air is available to everyone, and everyone needs it. Some people use the air to sustain them while    小题2:   (sit) around and feel sorry for themselves.    小题3:   breathe in the air and use the energy it provides to make    小题4:   magnificent life. Opportunity is    小题5:   the same way; it is everywhere. It is so freely available that we take it for granted. Yet opportunity alone is not enough to create success; it must   小题6:  (seize) and acted upon in order to have value.    小题7:  many people are so anxious to “get in” on a “ground floor opportunity”, as if the opportunity will do all the work that’s   小题8:  (possible). Just as you need air to breathe, you need opportunity to succeed. However, it takes more than just breathing in the fresh air of opportunity. You must make use of it. That’s not up to the opportunity; that’s up to you.   小题9:  doesn’t matter what “floor” the opportunity is on, but    小题10: matters is what you do with it.

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心跳、呼吸骤停病人最重要的诊断依据是()

A.无呼吸动作

B.意识突然丧失

C.颈动脉搏动消失

D.血压下降

E.两侧瞳孔不等大

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6σ活动的载体是()

A.规范具体的流程

B.数据采集系统

C.软件技术

D.关键因素

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地地战役战术导弹

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