点做直线运动,运动方程x=27t-t3,x的单位为m,t的单位为s。则点在t=0到t

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问题:

点做直线运动,运动方程x=27t-t3,x的单位为m,t的单位为s。则点在t=0到t=7s的时间间隔内走过的路程为( )。

A.154m
B.262m
C.54m
D.208m

考点:注册环保师环保公共基础知识注册环保工程师上午
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根据史书记载,西周初年的国家有800多个,到了春秋初年,还剩下170多个,战国之初,只有十几个了。这反映了历史发展的趋势是         (   )

A.弱肉强食

B.国家的数量越来越少

C.国家逐步走向统一

D.适者生存

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Dear Daughter,

As we drove off from Columbia, I wanted to write a letter to you to tell you all that is on my mind.

First, I want to tell you how proud we are. Getting into Columbia is a real proof of what a great well-rounded student you are. You should be as proud of yourself as we are.

It is in college that you will discover what learning is about. This will be the period where you go from teacher-taught to master-inspired, after which you must become self-learner. So do take each subject seriously, and even if what you learn isn’t critical for your life, the learning skills you acquire will be something you will treasure forever.

Follow your passion in college. Take courses you think you will enjoy. Don’t be trapped by what others think or say, but make up your own mind.

Most importantly, make friends and be happy. Pick a few friends and become really close to them – pick the ones who are genuine to you. Don’t worry about their grades, looks, or even personalities.

Start planning early. I think your plan to study fashion is good, and you should decide where you want to be, and get onto the right courses.

Whether it is coursework planning or picking a major, you should take control of your life. I will always be there for you, but the time has come for you to be in the driver’s seat – this is your life, and you need to be in control. Being in control feels great.

So please treasure your college years – make the best of your free time, become an independent thinker in control of your destiny fate, learn and grow through your successes and challenges.

May your years at Columbia be the happiest of your life, and may you blossom into just what you dream to be.

Love,

Dad (& Mom)

65. According to the letter the author’s daughter is ______.

A. scared to be leaving home                                      B. a well-rounded student

C. the pride of her university                                       D. learning to drive a car

66. Which advice below is given to his daughter by the author?

A. Party with friends in her free time.

B. Ignore what others think or say.

C. choose friends with similar personalities.

D. Treasure and make the best of her college years.

67. From the passage, we can conclude the father is ______.

A. worried about his daughter                                    B. strict with his daughter

C. positive about his daughter’s future            D. sad about his daughter’s leaving home

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生物硝化过程的主要影响因素()

A.溶解氧

B.pH及重金属有害物质

C.生物固体平均停留时间

D.以上各种因素

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“三降三不降”是什么?() 

A.官降吏不降

B.男降女不降

C.生降死不降

D.汉降番不降

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在演示教学课件的时候,不能播放课件中的音频材料,这种情况下可以排除的问题为()

A.音箱未开

B.在右下角的音量控制中选择了静音

C.音频材料没有与演示文稿连接好

D.课件太大,音频材料不能播放

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