【简答题】设传送数字信息为1011001,画出相应的2ASK信号波形。(画在纸上,拍照上传) 【可以参考课本P99页 图4.1(c)】
【判断题】高压10KV及以下的电压互感器交流耐压试验只有在通过绝缘电阻、介质损失角正切及绝缘油试验,认为绝缘正常后再进行交流耐压试验。
【简答题】、用 since 和 for 填空 1.______two years 2.____two years ago 3.___last month 4.______ 1999 5._______yesterday 6._______ 4 o’clock 7 4 hours 8._____an hour ...
【简答题】对形成恒沸物的某体系,下列说法不正确的是( )。 a.当压力确定后,其恒沸温度和恒沸组成确定; b.二元恒沸物的压力确定后,则恒沸温度和恒沸组成确定,而三元恒沸物则不然; c.除恒沸点外,在其余组成下,精馏仍具有分离作用; d.体系在恒沸点的自由度数目与恒沸物的组分数无关。
【简答题】He has studied here for about four years, _______________ ?
【判断题】10马基斯协议中规定,字母规则优先于数字规则。
【单选题】下列品种中属于肉牛,且有明显“三粉’’特征的是
【单选题】按照仙鹤形布局,又称“仙鹤寺”的清真寺是
【简答题】( ) 1 _____ here and ask him about it yesterday? A. Did you come B. Would you not go You didn't come D. Aren't you go ( ) 2 ___ he ___ a good time last Sunday? A. Were; were ...
【简答题】句型转换。 1. He has studied English for 4 years. (改为一般疑问句) he_____English for 4 years? 2. My parents have been to America . (就画线部分提问) _ _parents_____? 3. Lucy's traveled to another province. (改为否定句) Lucy ...