A. May I book a room for three nights? B. May I book a room for thirteen nights. C. May Ibook a room for staying three nights?
A. May Ipay by credit card? B. May I pay by travel's card? C. May I pay by travel's check?
A钢管 B. 铁管 C. 塑料管 D. 橡胶管
A. 金属纤维型 B. 金属网式 C. 纸芯式 D. 缝隙式