网络发展阶段

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问题:

网络发展阶段

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题型:问答题 简答题

某溶液中有Mg2+、Fe3+、Al3+、Cu2+等四种离子,向其中加入过量的NaOH溶液后过滤,将滤渣高温灼烧并将灼烧后的固体投入过量的稀盐酸,所得溶液与原溶液相比,溶液中大量减少的阳离子是[ ]

A.Mg2+

B.Fe3+

C.Al3+

D.Cu2+

题型:问答题 简答题

阅读下面的短文, 请根据短文后的要求答题(请注意问题后的字数要求)

Let me tell you about five of the enemies we face from within.The first enemy that you’ve got to destroy before it destroys you is indifference.What a tragic disease this is! “Ho-hum,let it slide. I’ll just drift along.” Here’s one problem with drifting:you can’t drift your way to the top of the mountain.

The second enemy we face is indecision(优柔寡断). Indecision is the thief of opportunity and enterprise.It will steal your chances for a better future.Take a sword to this enemy.

The third enemy inside is doubt.Sure,there’s room for healthy skepticism.You can’t believe everything.But you also can’t let doubt take over.Many people doubt the past, doubt the future,doubt each other,doubt the government,doubt the possibilities and doubt the opportunities.               , they doubt themselves.I’m telling you,doubt will destroy your life and your chances of success.It will empty both your bank account and your heart.Doubt is all enemy.Get rid of it.

The fourth enemy within is worry.We’ve all got to worry some.Just don’t let it conquer you.Instead, let it alarm you.Worry can be useful.If you step off the curb (路边) in New York City and a taxi is coming,you’ve got to worry.But you can’t let worry loose like a mad dog that drives you into a small coffer.Here’s what you’ve got to do with your worries:drive them into a small corner. Whatever is out to get you,you’ve got to get it.Whatever is pushing on you, you’ve got to push back.   

The fifth enemy is overcaution. It is the timid (胆小的) approach to life.Timidity is not a virtue;it’s all illness.If you let it go,it’ll conquer you.Timid people don’t get promoted.They don’t advance and grow and become powerful in the marketplace.You’ve got to avoid overcaution.       

小题1:What’s the best title for this passage? (Within 8 words)   

小题2:List three enemies inside that might prevent you from getting promoted.(Within 5 words)

小题3:Fill in the blank in Paragraph 3 with proper words or phrases.(Within 5 words)

小题4:Which sentence in the text is the closest in meaning to the following one?

However,you shouldn’t be forced into a small room by the worry beyond control.

小题5:Translate the underlined sentence in Paragraph 4 into Chinese.

题型:问答题 简答题
如图所示

,在两平行金属板中央有一个静止的电子(不计重力),当两板间加上交变电压后,能使电子有可能做往返运动的电压是(  )

A.

B.

C.

D.

题型:问答题 简答题

日常生活中用的高压锅,是利用______的道理来更快的煮熟饭菜的.

题型:问答题 简答题

某井井深2000m,地层压力25MPA、,则地层压力当量泥浆密度为()。

A、1.28g/Cm3

B、1.35g/Cm3

C、1.25g/Cm3

D、0.98g/Cm3

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