【单选题】Listen! Who _______ in the next room? [ ]
【简答题】Who is the best communicator that Ros knows?
【单选题】Who sings______, Rose or Kate?
【单选题】This is the girl _____ mother is a singer and she sings as _____ as her mother. [ ]
【单选题】Who sings ____, Rose or Kate?
【简答题】二极管具有 特性;当加 电压时,二极管呈截止状态。
【简答题】二极管具有 特性 ,即正向 ,反向 。 根据材料不同 可分为 二极管 和 二极管 。