抽余油加氢催化剂的型号是（），加氢反应空速为4h-1
参考答案：MH-705
A lot of famous doctors gathered in Harbin _________ save “ China’s most beautiful teacher” -Ms Zhang Lili. [ ]
A. so that
B. in order to
C. in order that
D. as a result
高产肥沃土壤要求的深厚的土壤耕作层的内涵是，其耕作层厚度不低于（）
A.15cm
B.20cm
C.25cm
D.30cm
