Generally it isnt harmful to our ears when sounds are up to______.A.140 decibelsB.100 dec

外语类 已帮助 人

Generally it isnt harmful to our ears, when sounds are up to______.

A.140 decibels

B.100 decibels

C.80 decibels

D.160 decibels

请帮忙给出正确答案和分析,谢谢!

热搜:medline数据库中to字段是表示非英文文献的原文题名