My demand is that the information referred to in my report _____ to Mr Brown without delay.[ ]

A.  to be e-mailed        

B.  e-mailed    

C.  be e-mailed          

D.  being e-mailed

以下哪项不是高压、次高压门站的设计原则必须保证的？

A.下游不可超压 

B.稳定上游压力 

C.可作调峰及下游压力管理