和鼻中隔后缘相接的是()。
A.蝶骨体
B.上鼻甲
C.腭骨水平板
D.筛骨垂直板和犁骨
E.中鼻甲
参考答案:D
_____ is known to all, the age _______ children can go to school is seven.
A.What; which
B.It; when
C.As; at which
D.Which; when
换向阀消障法根据制约信号选取可分为()和()。