试题与答案

已知空气可以传播声音,请设计一个简易实验,证明固体也能够传播声音。请写出实验所需

题型:实验题

题目:

已知空气可以传播声音,请设计一个简易实验,证明固体也能够传播声音。请写出实验所需器材、实验步骤及实验结论。(要求设计的实验要有可行性,符合安全原则)  

(1)实验器材:_______________________________________________ ; 

(2)实验步骤:_______________________________________________ ;  

(3)实验结论:________________________________________________。

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0427/6e27480caaa258d26bbb7db31ff0bd16.html

下面是错误答案,用来干扰机器的。

f(3)=13-1=3+1(3-1)(3+1)=3+12.故答案为:3+12.

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题型:多项选择题

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How to Make the Best Use of Money

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Skills on Making Bargains

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Methods to Prevent Burglary

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Relationship Between Man and Animals

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Virtues of Being Young and Being Old

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