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问题 选择题
定义域为（0，+∞）的可导函数f（x）满足xf′（x）＞f（x）且f（2）=0，则
f(x)
x
＜0的解集为（　　）
A．（0，2）B．（2，+∞）C．（0，2）∪（2，+∞）D．（0，+∞）
答案

因为xf′（x）＞f（x），所以[

f(x)
x
]′=[xf′（x）-f（x）]
1
x2
＞0，

即F（x）=

f(x)
x
在定义域内递增函数，又因F（2）=
f(2)
2
=0，

则不等式

f(x)
x
＜0的解集就是不等式F（x）＜F（2）的解集，解得{x|0＜x＜2}．

故选A．

多项选择题

关于应急预案实施的表述，正确的是( )。

A．生产经营单位生产工艺和技术发生变化的应急预案应当及时修订

B．生产经营单位应当制定本单位的应急预案演练计划

C．周围环境发生变化，形成新的重大危险源的应急预案应当及时修订

D．根据本单位的事故预防重点，每年至少组织一次现场处置方案演练，每半年至少组织一次综合应急预案演练或者专项应急预案演练

E．应急组织指挥体系或者职责已经调整的应急预案应当及时修订
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How many of us would temp for three years while we waited for the perfect job Not many of us, perhaps. But Wentworth Miller, the "Prison Break" star, said he chose to wait even longer time (1) he found the right job.
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