影响SO2转化率的催化剂特性有催化剂组分、外形、()和()等。
参考答案:内表面面积;晶相结构
This poem is written by Li Bai from Tang Dynasty. Can you _____ it in English? [ ]
A. speak
B. say
C. tell
D. talk
装运超长、超高或重大物件,用超长架装载超长物件时,在其尾部应设()。
A.警告标志
B.安全标识
C.提示标识
D.明显标识