邻面板不具备下列哪项作用()
A.引导就位
B.减少义齿对基牙损害
C.防止食物嵌塞
D.增强义齿强度
E.降低余留牙的龋病发生率
参考答案:D
我国最早建立县制是在 [ ]
A.春秋
B.战国
C.秦朝
D.汉朝
The purchaser of this lorry is protected by the manufacturer’s warranty that he will replace any defective part for five years or 50,000 miles.
A. prohibition B. insurance C. prophecy D. guarantee