We have received orders ______ USD 1,000,000 since the new product was introduced to the market.

A．amount for

B．amount to

C．account for

D．amounting to

蜡油加氢裂化装置原料油缓冲罐的压力可以采用（）控制。

A、简单

B、串级

C、分程

D、三冲量