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问题 选择题
若函数f(x)=
(a+1)x+b
x
（a，b为常数）在区间（0，+∞）上是减函数，则（　　）
A．a＞-1B．a＜-1C．b＞0D．b＜0
答案

f(x)=

(a+1)x+b
x
（a，b为常数）=（a+1）+
b
x

∵

1
x
在区间（0，+∞）上是减函数

只需b＞0即可使

b
x
在区间（0，+∞）上是减函数

∴使函数f(x)=

(a+1)x+b
x
（a，b为常数）在区间（0，+∞）上是减函数，只需b＞0

故选C

填空题



Every human being is fallible; we make mistakes. In America when a mistake has been made, it is considered fitting for the person (1) to acknowledge his or her error and to apologize to anyone who has been inconvenienced. Even (2) are expected to admit their mistakes and apologize for them. Trying to (3) a mistake and denying your guilt are considered to be indicative of serious (4) .
If you make a mistake that (5) a group of people, a public apology is considered the best method for (6) . If the mistake was a serious one, or if some people were inconvenienced more than others, then the (7) should follow the public apology with private ones to (8) .
It is especially important for executives and company heads to be able to admit their mistakes. Sometimes leaders are afraid that if they (9) , they will lose the respect of their employees. Actually (10) — if you are honest with your employees and yourself, (11) , and show that you are willing to accept blame when you make a mistake, then your employees will be (12) you. They will also be more likely to admit their own mistakes.
If you (13) one person, it is usually best to apologize to that person alone, unless your mistake (14) by a large group of people. For example, if Leonard (15) to Mr. Todd during a committee meeting, it would be (16) for Leonard to apologize to Mr. Todd at the next committee meeting. If the (17) created by the initial mistake is public, then the apology should be public. However, if Leonard raised his voice to Mr. Todd when only the two of them (18) , he may apologize privately. Notice as well (19) the apologies are. As soon as you realize you have made a mistake, you should (20) .
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多项选择题

构建风险控制的内容主要有（）

A、建立安全生产责任制

B、建立特种作业人员及特种设备作业人员财务管理台账

C、加强风险隐患的分级管理和隐患治理

D、职业健康管理
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