烧伤药膏在应急医疗箱里面。()
参考答案:错
I need ______ to do my homework. [ ]
A. half an hour
B. half a hour
C. half hour
D. half hours
联购合销是指由几个配件零售企业联合派出人员,统一向生产企业或批发企业进货,然后零售企业分销。( )