CO2气提法尿素装置高压系统过料后，入系统原料NH3/CO2（摩尔比）是（）。
A.2.0
B.2.05
C.2.87
D.2.89
参考答案：B
Next week, _____ the students will have a basketball game. [ ]
A. may be
B. may
C. maybe
D. can
检查接车线空闲有哪些方法？
