自接型
参考答案：
陆生脊椎动物颌弓与脑颅的连接方式，颌弓的腭方软骨直接与脑颅相连，其后的方骨与下颌的关节骨成关节。
Which is not the characteristic of operating system
A．resource management
B．transaction management
C．memory management
D．disk management
This is _____ book. And it is ____ English book.
A．a, a
B．an, an
C．a, an
D．an, a
