制作功能良好的固定义齿主要条件应是
A.有坚固的基牙
B.桥体的解剖外形与天然牙一样
C.义齿的咬合关系与余牙协调
D.桥体与龈组织接触紧密
E.固位体必须是全冠
参考答案:A
药用部位是花蕾的药物是()
A.天花粉
B.香薷
C.丁香
D.小茴香
E.荜茇
Can you explain ________ the sun goes down in the west?
A.why is it that
B.why it is that
C.how it is that
D.how is it that