问题
填空题
一些我们人看不见的光、听不到的声音在生活中有广泛的应用,如电视机的遥控器是利用______工作的,声呐是利用______工作的.
答案
(1)电视机遥控器是利用红外线进行遥控的.
(2)声呐是利用超声波工作的.
故答案为:红外线;超声波.
一些我们人看不见的光、听不到的声音在生活中有广泛的应用,如电视机的遥控器是利用______工作的,声呐是利用______工作的.
(1)电视机遥控器是利用红外线进行遥控的.
(2)声呐是利用超声波工作的.
故答案为:红外线;超声波.
阅读理解。 | |||
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1. Sunny English Club is for ______. | |||
A. nurses B. policemen C. businessmen D. students | |||
2. You will pay ______ if you want to stay in the English club for half a year. | |||
A. 300 yuan B. 600 yuan C. 1,200 yuan D. 2,400 yuan | |||
3. You can visit Ocean Museum ______. | |||
A. on Saturday B. on Wednesday C. on Monday D. anytime | |||
4. One can get free examinations in Health Centre if he is ______. | |||
A. 9 B. 17 C. 67 D. 73 | |||
5. If you are interested in the life of fish, you should go to ______. | |||
A. Health Centre B. Ocean Museum C. Sunny English Club D. 16 Yong Le Street |