水的比热容是煤油比热容的二倍。对于质量均为100g、初温均为20℃的水和煤油,下

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问题:

水的比热容是煤油比热容的二倍。对于质量均为100g、初温均为20℃的水和煤油,下列判断正确的是

A.水和煤油升高相同的温度,水吸收的热量是煤油吸收热量的二倍

B.水和煤油降低相同的温度,煤油放出的热量是水放出热量的二倍

C.水和煤油放出相同的热量,煤油降低的温度是水降低温度的二倍

D.水和煤油吸收相同的热量,煤油的末温是水末温的二倍

考点:比热容的概念
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女性,26岁,4小时前从5m高处坠落,臀部着地,顿感腰背部疼痛,下肢活动障碍。

至医院行X线检查示T12爆裂性骨折,CT示骨折块移位并突入椎管,MRI检查提示脊髓明显受压,此时最有效的治疗方法是()

A.痛点封闭

B.卧床休息

C.按摩推拿

D.理疗

E.手术治疗

题型:选择题

列式计算.

(1)1.5与8.5相加的和,再乘0.86,积是多少?

(2)0.5与80的积减去什么数的2.5倍等于3.75?

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短文填空 根据短文内容及首字母提示,补全空格内单词,使短文完整、通顺。(请在答题卡上写出完整单词)(本大题共10小题,满分10分)

A blind boy sat on the steps of a building with a hat by his feet. He held up a sign which said: “I am blind, please help.” There were only a few coins in the h  小题1: .

A man was w  小题2:  by. He took a few coins from his pocket and dropped them into the hat. He then took the sign, wrote some words on the other side of it. Then he put the sign back s__小题3:__ that everyone who walked by would see the new words.

Soon the hat began to fill up. A lot m  小题4:  people were giving money to the blind boy. That afternoon the man who had c  小题5: the sign came to see how things were. The boy recognized his footsteps and asked, “Were you the one who changed my sign this morning? What did you write?”

The man said, “I only wrote the truth. I said what you said but in a d  小题6:  way.”

What he had written was: “Today is a beautiful day, b  小题7:  I cannot see it.”

Do you think the first sign and the second sign were saying the same thing? Of course b小题8:  signs told people the boy was blind. But the first sign s 小题9:  said the boy was blind. The second sign told people they were so l  小题10:  that they were not blind. Should we be surprised that the second sign was more effective?

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对初学者而言,"速度障碍"的发生原因是什么?发生后如何消除?

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简述昆虫纲繁盛的原因

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