This new type ______ camera is ______ high quality and is not expensive.

A．of; on

B．on; of

C．of; of

D．on; on

误吸处理不必要的是（）

A.取右侧卧头低足高位

B.PEEP通气

C.支气管冲洗

D.呼吸兴奋剂

E.激素治疗