【单选题】When are windows the weak link in a building?
C.
When air conditioners are turned on.
【简答题】交通运输业,指利用运输工具专门从事 ____ 服务的企业或直接为____服务的企业。
【单选题】植物吸收矿质量与吸水量之间的关系是( )
【单选题】When are windows the weak link in a building?
C.
When air conditioners are turned on
【单选题】外阴色素减退疾病的治疗,以下错误的是( )