消声室(无回声室)内使用的吸声尖劈其吸声系数为( )。A．1．0 B．＞0．99 发布时间：2017-06-21 22:50 │ 来源：www.tikuol.com 题型：单项选择题 问题： 消声室(无回声室)内使用的吸声尖劈其吸声系数为( )。A．1．0B．＞0．99C．＞0．80D．＞0．50
题型：单项选择题 完形填空。 I have two new friends. One is a girl. 1 name is Linda. She is from 2 . She istwelve 3 old. She is a student 4 Beijing International School. She is in 5 . She can speak 6 and English. Her parents 7 teachers at a middle school. The other is Liu Kun. He is a Chinese 8 . He is eleven. He is in Class One, too. He can speak Chinese well 9 he can't speak English. His parents are 10 workers. ( )1. A. He ( )2. A. Ameia ( )3. A. year ( )4. A. with ( )5. A. Grade seven, Class four( )6. A. Englih ( )7. A. is ( )8. A. boy ( )9. A. and ( )10A. factory B. She B. American B. years B. on B. Seven Grade, Four ClassB. China B. are B. girl B. too B. factories C. His C. Chinese C. weeks C. at C. Class Four, Grade SevenC. Chinese C. am C. teacher C. but C. factory's D. Her D. English D. month D. and D. grade seven, class fourD. England D. be D. manager D. at D. factorys 查看答案