问题
单项选择题
超声波探头辐射的声场中，声压以（）最高。
A.旁声束上
B.半扩散角以外
C.中心轴线上
D.扩散角与旁声束交界部位
答案
参考答案：C
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超声波探头辐射的声场中，声压以（）最高。
A.旁声束上
B.半扩散角以外
C.中心轴线上
D.扩散角与旁声束交界部位
参考答案：C
完形填空(共20小题；每小题1.5分，共30分) 阅读下面短文，掌握其大意，从每题所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。 Ban the Band(乐队)？ Every year,our school has a dance for all the students.It’s a little funny seeing friends in clean shoes and trousers or colorful 36 ,instead of the usual school uniform. Most of us think the dance is great 37 —even the teachers enjoy being there. 38 ,two weeks ago someone said that there would be no 39 band this year—only CDs. “I don’t 40 it!”Amy cried out during the lunch break. “Someone said the school couldn’t 41 a band,and they think it’s too noisy anyway,”added Daniel. “Well,I don’t think it’s 42 enough without a band!”declared Angela,“and I’m going to see what can be done.” Angela was as good as her 43 .In the afternoon she went to see the school headmaster who agreed to give the 44 some more thought.And he suggested that one 45 for having a band was to increase the price of each ticket from $5 to $10.Angela had to 46 out whether the students would like to do that. “I need all of you to help me,”she 47 to our group before school the next day.“Mr.Berry gave me a list of all the names,and suggested we ask each one their 48 about the band and the extra cost.” 49 the day we asked around as Angela suggested,and wrote down people’s feelings about the band and the cost.We were amazed how much 50 there was for the band and everyone agreed to pay the extra $5. “I’m surprised,”smiled Mr. Berry,when we gave him the 51 .“I really thought that only a few people 52 their band and that the cost would be too high.OK,Angela,your next 53 is to find a good band and line them up for the dance.” Angela was all smiles and 54 the news to Amy and Daniel.“You’re 55 ,”smiled Daniel to Angela as he thought how close they came to having a less than perfect dance.
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