“与”门的作用如同是()串联。
参考答案:两个开关与负载
— ______ is it from your house to the bus stop?
— About five minutes’ walk.
A.How far
B.How often
C.How soon
D.How long
牙周病活动期牙槽嵴吸收表现为
A.牙槽骨吸收边缘可见薄层致密骨形成
B.骨纹理增粗,骨硬板增厚
C.骨硬板不清晰,部分或全部消失
D.牙槽骨吸收边缘整齐、平滑
E.牙骨质增生,牙周膜间隙变窄甚至消失