【单选题】We were talking about the American tourist _______ we met during our trip to the Great Wall.
【单选题】二阶压控高通滤波电路,在低频段相频特性变化规划律是( )度/十倍频。
【简答题】Last August ,our class________ something very special on our school trip .We ________ to Mount Tai .We ________ our trip at 12:00 at night .Everyone in our class _______ a bag with some food and water...
【简答题】We were talking about the American tourists___we met during our trip to the Great Wall.