A.15~20°C B.18~20°C C.18~25°C D.15~25°C
A.晴天,多云天,全陰天 B.晴天,多云天,雨天 C.晴天,多云天,陰天 D.晴天,陰天,雨天
A.聲源通過 B.光源通過 C.氣流通過 D.介質(zhì)