原料质量、（）、轧件温度是工艺上保证高速轧制主要条件。
A.轧辊质量
B.操作水平
C.轧件精度
参考答案：C
Jim is a reporter. He _____ people. [ ]
A. likes talking
B. likes talk to
C. like talking to
D. likes talking to
乙酸乙酯制备中粗产品中含有哪些杂质？
