工程造价原则上属于()。
A.固定价
B.可调价
C.市场价
D.控制价
参考答案:C
I was told that _______ 10:20 flight would take us to Shanghai in time to reach _______ Fudan University.
A.the; /
B.the; a
C.a; the
D./; the
原料气不经过脱硫处理直接入工艺系统易导致()。
A、水碳比过小
B、转化触媒硫中毒
C、触媒粉碎
D、转化反应不彻底