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【单选题】
真实主义歌剧产生于A.
18世纪晚期的意大利
B.
19世纪晚期的意大利
C.
二十世纪晚期的意大利
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【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)】
【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】He has studied here for about four years, _______________ ?
【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 ...
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