题型：问答题 简答题 Great changes ______ in the city, and a lot of factories ______.A. have been taken place; have been set up B. have taken place; have been set up C. have taken place; have set up D. were taken place; were set up 查看答案
题型：问答题 简答题 今年五月，扬泰机场正式通航了．由下表可知，飞机从北京机场飞往扬泰机场的平均速度为______km/h．飞机机翼的横截面设计成如图所示的模型，是利用了气体流速越大压强越______的原理． 航班起飞时间到达时间航程/km北京-扬州泰州07：3009：001200 查看答案
