A（） is a software that provides a method of communication between two electronic devices over the World Wide Web.

A．roister

B．cobber

C．J2EE

D．web service

支气管扩张症患者做体位引流的时间宜在何时进行()

A．早晨

B．上午

C．晚上

D．饭前

E．饭后