挤压效应
参考答案：
挤压效应是指某些铝合金挤压制品与其他加工制品（如轧制、拉拔和锻造等）经相同的热处理后，前者强度比后者高，而塑性比后者低。
It is the news most parents of the hope that there is a safe and socially approved
road to a kind of life they themselves have not had, but their children can.
A．that deprive
B．that it deprives
C．that deprives
D．when it deprives
主诉牙最可能的诊断是()
A．可复性牙髓炎
B．急性牙髓炎
C．慢性牙髓炎急性发作
D．急性根尖周炎
E．慢性根尖周炎
