This monument was built in honor of the scientist who was believed ______ the first telephone.

A．to invent

B．to have been invented

C．to have invented

D．having been invented

低血容量性休克的特点是（）。

A.全血、血浆或水盐丧失

B.低血压

C.低中心静脉压

D.低心排出量

E.DIC