题型:单项选择题 在住宅设计中,对于楼板和隔墙,以下说明正确的有()A.标准撞击声级Ln越大,说明楼板撞击声隔声效果越好B.国标中,楼板一级标准为Lnp,w≥65dB,二级标准为Lnp,w≥75dBC.国标中,隔墙一级标准为Rw≥50dB,二级标准为Rw≥45dBD.隔墙的计权隔声量为Rw,它是隔墙两边两个房间的A声级的差 查看答案
题型:选择题 --- Don’t you think it necessary that he __________ to Miami but to New York?--- I agree, but the problem is _______ he has refused to.A.will not be sent; thatB.not be sent; thatC.shouldn’t be sent ; whatD.should not send; what 查看答案