__ plastcis , the machine is light in weight.

A．To make of

B．To be made of

C．Made of

D．Having made

重症肺炎与轻症肺炎的区别在于

A．体温的高低

B．是否累及循环、神经等系统

C．咳嗽的程度

D．肺部罗音的多少

E．X线表现