旋转机构按其支承装置形式可分为哪两大类？

Nowadays, more and more people like to hunt for what they want at www.taobao.com and have them ____ by the express company.

A．delivering

B．delivered

C．to deliver

D．deliver

药物在体内代谢的主要器官是

A．大肠
B．胃
C．肾脏
D．肝脏
E．胆囊

描述鼓室的位置、各壁的名称和结构。

AT中典型的有源传感器是（）传感器。