【单选题】They eat five ____________ of vegetables and fruit every day.
【简答题】They eat five ( ) of vegetables and fruit every day.
【判断题】串扰是指当一个线对中的两条导线,相互交接的时候就发生了干扰,串扰常见于配线架和电缆连接器的错接。
【判断题】串扰是指当一个线对中的两条导线,相互交接的时候就发生了申扰,串扰常见于配线架和电缆连接器的错接。
【单选题】某砂的细度模数为2.6,则该砂为( )。
【单选题】They eat five ____________ of vegetables and fruit every day.