您所在的当前位置：初中物理试题 >

防治噪声的途径

> 关于声现象，下列说法中正确的是 A.声音在不同介质中的传播速度相同 B.学校附近“禁止鸣笛”，是为了在传播过程中减弱噪声 C.诗句“不敢高声语，恐惊天上人”中的“高”是指声音的音调高 D.“闻其声而知其人”是根据声音的音色来判断的

问题：

发布时间：2020-03-13

关于声现象，下列说法中正确的是

A.声音在不同介质中的传播速度相同
B.学校附近“禁止鸣笛”，是为了在传播过程中减弱噪声
C.诗句“不敢高声语，恐惊天上人”中的“高”是指声音的音调高
D.“闻其声而知其人”是根据声音的音色来判断的

参考答案：

提问用户：v2***e46

可能感兴趣的题目：

1 如图的流程图最后输出的n的值是______．
2 ________ lovely dog! Everyone in my village likes it. A.How B.What a C.What D.Which
3 Remember to ________ a good state of mind even if you should fail plenty of times． A．take up B．brush up C．get up D．keep up
4 已知 a =(2，-3)， b =(1，m)（m∈R）， c =(2，5) （I）若 ( a + b )• c =1，求m的值；（II）若 ( a - b )•( b + c )＞0，求m的取值范围．
5 Is it in this room in _____ the great writer once lived ____ he finished his last works? A．which; that B．that, where C．that; which D．where; that
6 （14分）下图是一个制取氯气并以氯气为原料进行特定反应的装置：（1）A是氯气发生装置，化学反应方程为（2）实验开始时，先点燃A处的酒精灯，打开旋塞K，让Cl 2充满整个装置，再点燃D处酒精灯，连接上E装置。Cl 2通过C瓶后再进入 A．D装置的硬质玻璃管内盛有炭粉，发生氧化还原反应，其产物为CO2和HCl。试写出D中反应的化学方程式：。装置C的作用是。（3）在E处，紫色石蕊试液的颜色由紫色变为红色，再变为无色，其原因是。（4）若将E处烧杯中溶液改为澄清石灰水，反应过程现象为。（填代号） B．有白色沉淀生成 C．无现象 D．先生成白色沉淀，而后白色沉淀消失（5）D处反应完毕后，关闭旋塞K，移去酒精灯，但由于余热的作用，A处仍有Cl 2产生，此时B中的现象是， B的作用是。
7 阅读理解。 A middle-aged stranger visited us late on a dark rainy night when my father was working the night shift (a job for a period during the night). The stranger asked if he could wait under the eaves of our roof for the rain to stop. Then he disappeared, and we started hearing footsteps and creaking boards in the attic (the space or room at the top of a building, under the roof, often used for storing things). Was the stranger inside our house? My whole body couldn"t help but stiffen. In my mind"s eye, I could imagine the stranger pushing through the attic door and approaching US. We immediately called Jerry, our neighbor, for help. He searched everywhere, but the visitor was nowhere to be found. As Jerry looked in the garage, he found the stranger lying underneath the car. Jerry exclaimed with fright, "You are not allowed to enter the house. Get off the property right now." We were determined to leave the house immediately. As we drove away, we saw the man blocking our way on the road and staring at us. We had to change the direction to avoid meeting him. After that, I never saw the stranger again. 1. The text is mainly about _____. A. the neighbor Jerry B. a strange dream C. a strange visitor. D. footsteps in the attic 2. Based on the text, which of the following statements is true? A. The family hit the stranger with their car. B. The stranger pushed through the family"s door. C. Jerry was hurrying back from the night shift. D. The author"s father wasn"t at home that night. 3. Why did the family leave their house on a late, dark night? A. It was raining hard and the eaves of their roof were broken. B. There was a ghost wandering around the house. C. They did not feel safe in their house. D. The stranger was still somewhere inside the house. 4. The text was written in order of _____. A. time B. space C. importance D. age of the family
8 已知角α终边经过点P（-2，3），则α的正弦值为______．
9 南极考察最佳时间是 A.我国南方早稻收获的季节 B.巴西高原的热带草原草木茂盛的季节 C.地中海沿海炎热干燥的季节 D.摩尔曼斯克港出现极昼的现象的季节
10 What really ________ is not failure itself, but the attitude we hav e towards it． A．matters B．applies C．stresses D．functions