声音练习4（Voice exercise 4）.doc

声音练习4（Voice exercise 4） I dont expect anything, I just hope that your future women will be less than one. I miss my childhood, when it was hot, I could be like a mans shirtless! 5. The distance between xiao Ming and the cliff is about (). Figure 4-2 measurement A. 340 m B. 170 m c. 34m d. 17m 6. The following experiments and examples show that a group of conditions of production or transmission of sound are () Put some scraps of paper on the drum, and the scraps of paper can be observed while beating the drum. Put it on the cell phone in the vacuum cover. When there is a call, the indicator light blinks. Take a hard piece of paper, and let it run on the comb tooth, a quick one, a slow one at a time, and a different one. When the gong sounds, the gong and the gong will disappear A. (1) (2) (3) b. (2) (3) (4) c. (1) (3) (4) d. (1) (2) (4) 7. Our country has made the shenzhou spacecraft loaded test. In the near future, our countrys astronauts aboard the spacecraft into space, astronauts in space can be direct dialogue, but outside the spacecraft operation, no direct dialogue between them, must be in communication with the aid of communication equipment. The reason for this is that () A. Communication equipment is used to facilitate the transmission of sound C. The noise in space is too big D. Sound can only be spread on the ground After a heavy snowfall, people will feel that the outside world is quiet. The reason why you think is correct is () A. It could be that after the snow, the traffic was reduced and the noise decreased. B. It may be snow, the earth is silvery, the noise is reflected. C. It is likely that the snow is fluffy and porous and has a absorption effect on the noise. D. It may be that the temperature is lower after the snow, and the noise is slower. 9. When the drums are beating, the scraps of paper that are sprinkled on the drum will beat, and the louder the drum beats, the higher the paper chip will jump. To reach the surface of the sound of the sound