未分类题
A.室外气温的平均值B.太阳辐射热的作用和室外空气的传热C.室外气温和室内气温的平均值D.室外气温和室内气温之和
A.Whether she has any letters.B.If she has used enough postage.C.How soon a parcel will be delivered.D.Where to find a mail box.