计算声压级的基准声压是() A.100HZ纯音的听阈声压 B.100HZ纯音的基准声 发布时间:2017-09-08 02:22 │ 来源:www.tikuol.com 题型:单项选择题 A1型题 问题: 计算声压级的基准声压是()A.100HZ纯音的听阈声压B.100HZ纯音的基准声压C.1000HZ纯音的听阈声压D.1000HZ纯音的基准声压E.1000HZ纯音的痛阈声压
题型:单项选择题 A1型题 74. We went _____ our plan carefully before we carried it out.A.throughB.offC.outD.With 查看答案