有关瞬时速度、平均速度、平均速率,以下说法正确的是() A.瞬时速度是指物体在某一位

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问题:

有关瞬时速度、平均速度、平均速率,以下说法正确的是()

A.瞬时速度是指物体在某一位置或某一时刻的速度

B.平均速度是物体在一段时间内位移与所用时间的比值

C.做变速运动的物体,平均速率就是平均速度的大小

D.物体做变速运动时,平均速度是指物体通过的路程与所用时间的比值

考点:高中物理速度(速率)速度(速率)题库
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Six Ways to Improve Reading Comprehension

Help your child keep what he reads—a crucial skill, especially as he gets older and needs to gain important information from textbooks.

Have him read aloud. This forces him to go slower, which gives him more time to process what he reads.  71 

Provide the right kinds of books. Make sure your child gets lots of practice reading books that aren’t too hard.  72  Stopping any more often than that to figure out a word makes it tough for him to focus on the overall meaning of the story.

  73  To gain meaning from text, your child needs to read quickly and smoothly—a skill known as fluency. Rereading familiar, simple books gives your child practice at decoding words quickly so he'll become more fluent.

Talk to the teacher. If your child is struggling hard with comprehension, he may need more help with his reading—for example, building his vocabulary or practicing phonics skills.

Supplement class reading. If his class is studying a particular theme, look for easy-to-read books or magazines on the topic. Some prior knowledge will make his way through tougher classroom texts.

Talk about what he's reading. This “verbal processing” helps him remember and think through the themes of the book.  74 For example:

Before: “What interests you in this book? What doesn't?”

●During: “  75 Is it turning out the way you thought it would? ”

●After: “Can you summarize the book? What did you like about it?”

A.Reread to build fluency.

B.What's going on in the book?

C.Look up new words in the dictionary.

D.Do you know all the characters in the story?E. Ask questions before, during, and after a reading session.

F. Plus, he's not only seeing the words, he's hearing them, too.

G. He should recognize at least 90 percent of the words without any help.

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患儿,8个月,发热伴间断呕吐10d,体检精神可,较兴奋,方颅,前囟门稍饱满,脑脊液检查:外观呈毛玻璃样,细胞数300×106/L,中性0.60,蛋白0.43g/L,氯化物108mmol/L,糖2.5mmolL,此患儿的诊断应该是()

A.化脓性脑膜炎

B.结核性脑膜炎

C.病毒性脑膜炎

D.流行性脑膜炎球菌性脑膜炎

E.感染中毒性脑病

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在资本市场内部,长期信贷的资金来源依赖于证券市场。

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Java对象串行化技术,主要是通过ObjectInputStream类和 【8】 类来实现的。

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施工前必须使用测量工具测量使用电源的电压,电流等,保证电源参数符合用电要求,严禁使用未知,未测量电源。

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