掌握订房动态，为领导提供决策参考的重要措施是（）的数量统计和信息传递。
A、订房预测
B、超额预订
C、团体预订
D、散客预订
参考答案：A
It was very late at night, he still went on . [ ]
A. works
B. worked
C. working
D. work
轧机的弹塑性曲线是轧机的弹性曲线与轧件的塑性变形曲线的总称。
