问题
单项选择题
某厂的鼓风机产生噪声，距鼓风机3m处测得噪声为85dB，鼓风机距居民楼30m，该居民楼执行的噪声标准是55dB，如果要达标，则居民楼应离鼓风机的距离是( )m。
A．64
B．80
C．95
D．110
答案
参考答案：C
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某厂的鼓风机产生噪声，距鼓风机3m处测得噪声为85dB，鼓风机距居民楼30m，该居民楼执行的噪声标准是55dB，如果要达标，则居民楼应离鼓风机的距离是( )m。
A．64
B．80
C．95
D．110
参考答案：C
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| My school has about 760 students in three grades-grade seven to 1 . It has 60 full-time (专职的) teachers and 18 classrooms. I go to school at 6:45 a.m 2 bus. My school starts at 8:00 o'clock. Everyone must go to school 3 it starts. I have seven classes in a day, four in the morning and three in the 4 . After class 4 everyone goes to have lunch in the canteen (食堂). Not many students go home for lunch because food in the canteen 5 nice. Class 5 starts at 1:50 p.m. and class 7 is 6 3:50 to 4:35 p.m. After class 7 some students stay (停留,逗留,呆) at school, some 7 home. The most popular sport at school is basketball. I usually go home at 5:00 p.m. Sometimes I go to play football and basketball at my old school 8 go to learn English with my teacher there and do homework too. After that I go home by bus. When I 9 home, I have supper then clean my home and 10 my homework. | ||||
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