关于声现象，下列说法中正确的是_刷题宝

题干

关于声现象，下列说法中正确的是（）

A：真空也能传声

B：声音在不同介质中的传播速度相同

C：道路旁植树可以有效地减弱噪声的传播

D：正常的人耳只能听到20Hz一2000Hz之间的声音

上一题下一题 0.0难度选择题更新时间:2011-05-12 10:11:00

答案(点此获取答案解析）

C

同类题1

西汉初期吸取秦亡教训，开始采取休息生息政策的皇帝是（）

同类题2

如图Rt△ABC中，∠ACB=90°，∠B=30°，AC=1，且AC在直线l上，将△ABC绕点A顺时针旋转到①，可得到点P₁，此时AP₁=2；将位置①的三角形绕点P₁顺时针旋转到位置②，可得到点P₂，此时AP₂=2+

\sqrt{3}

；将位置②的三角形绕点P₂顺时针旋转到位置③，可得到点P₃，此时AP₃=3+

\sqrt{3}

；…按此规律继续旋转，直到点P₂₀₁₂为止，则AP₂₀₁₂等于（）

同类题3

15.6＋14.4=____ 9.5－3.6=____ 604÷2=____

同类题4

B

My name is Alice. I have four aunts. They are all great women. Now, let's learn about them.

This is Emily Smith. She is my father's sister. She is twenty-eight years old. She works at a big computer company.

This is Rachel Smith. She is my father's sister, too. She is thirty years old. She is a doctor. She takes care of （照顾）patients in a hospital. This is her office. There is a little girl in front her.

This is Julia King. She is my mother's sister. She is forty-five years old. She is a scientist（科学家）. She works in a lab. It's not big but it's really nice.

This is Alison King. She is my mother's sister too. She is thirty-two years old. She is a policewoman. Her job is at a police station.

同类题5

图是中国局部区域略图，读图并结合材料回答问题。

材料继深圳、珠海、汕头、厦门和海南之后，2010年5月，中央正式批准喀什设立经济特区。经济特区的设立，对区域经济的发展具有重要战略意义。

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