【单选题】A typical instant-messaging conversationlasts ________. A.at least one hour B.more than one hour C.at least half an hour D.more than one place
【简答题】A.She is late. B.She is never on time. C.She feels angry. D.She doesn't want to be blamed.
【简答题】所谓避雷器的防雷接地引下线采用“三位一体”的接线方法是:避雷器接地(),配电变压器的金属外壳和低压侧中性点这三点连接在一起,然后共同与接地装置相连接,其工频接地电阻不应大于()欧姆。
【单选题】在电阻电路、电感电路、电容电路中,电流和电压关系的共同点是( )。
【单选题】—Sally never comes late, ______she? —No. She is always the first one to come to school. [ ]
【单选题】Winning a gold medal in the Asian Games is an unforgettable moment for her,________she will never forget. [ ]
【单选题】She is never late for school, _____ she?
【简答题】共集电极放大器又称____ ,它的特点是:电压放大倍数小于而接近于____,输出电压与输入电压相位相同,输入电阻____输出电阻____。