对10000只某产品进行耐用性能测试,根据以往资料,耐用时间标准差为51.91小时,

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问题:

对10000只某产品进行耐用性能测试,根据以往资料,耐用时间标准差为51.91小时,若采用重复抽样方法,概率保证68.27%,平均耐用时数的误差范围不超过9小时。则在这种条件下应抽取的产品为()只。

A.28

B.30

C.33

D.34

考点:统计从业统计基础知识与统计实务统计从业资格统计基础知识与统计实务模拟试题(六)
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由于地球的______,产生了季节的变化,南半球的季节与北半球______.

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纽约《论坛报》是由()1841年4月创办的

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工程监理企业参与或承担项目决策阶段的监理工作,有利于( )。

A.促使承建单位保证建设工程质量和使用安全
B.规范工程建设参与各方的建设行为
C.实现建设工程投资效益最大化
D.提高建设工程投资决策科学化水平

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Everyone gets angry sometimes, but being angry doesn’t really solve much. Your goal is to calm yourself down. This is (1) for some people. Instead of calming down, they might get more and more upset (2) they explode like a volcano. Some people might say they have trouble (3) their temper. Sometimes angry feelings can be hard to (4) . So what do you do if your temper is like a volcano

Well, the good news is (5) people don’t keep making the same mistakes over and over again. You can train your temper. Here are steps you can (6) at any time.

Get a lot of (7) activity. Exercise can be good because it is a way of (8) energy and stress. You can dance around your room (9) your favorite music, too.

Talk to your mom or dad. If you’re having trouble with your temper, tell your parents you’re trying to do a (10) job of controlling yourself. Let them know you are going to ask for their help.

Put (11) into words. Get into the habit of saying what you are feeling and why. (12) using words might help you manage your p feelings and behaviors.

Take a break from the (13) . If you are in an argument with someone, go to another part of your house. You can just say, "I want to be (14) for a while so I can calm down. "

Go into a (15) . If you fed angry and think you need a timeout to calm down, don’t (16) your parents to tell you to take a timeout for yourself. Let your family know that when you’re taking a timeout, they need to (17) your space and leave you alone. While you are sitting in your chair, try to take deep (18) .

Learn to shift. The idea is to shift from a really angry mood to a better mood. After you (19) the angry feelings out, you have to start thinking about other things, You can say, "I (20) my temper, but I’m going to get myself under control now.

9()

A.with 

B.to 

C.on 

D.about

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