栲胶浸提液蒸发不常采用的方法是
A、真空蒸发
B、多效蒸发
C、并流蒸发
D、逆流蒸发

A．Your parents
B．The person that invited you to speak
C．The audience themselves
D．Your public speech teacher

A.谷歌
B.Facebook
C.亚马逊
D.微软
E.百度