【简答题】数字信号的特点是在数值上是()连续的离散信号。
【单选题】— Hi! Lucy. We won the match yesterday! — ________
【单选题】— Don't play in the street, children! — . [ ]
【单选题】We won’t know whether it will be successful. We won’t know whether there will be good _____.
【单选题】—Hi, Lucy. Our school won the football match yesterday. —_______
【单选题】水附于憎水性(或疏水性)材料表面上时,其润湿角(接触角)为( )