钝化剂的作用及原理是什么?
参考答案:
加注金属钝化剂后,可缓解金属对催化剂的中毒,减少H2产率和焦炭产率,提高轻质油收率。
Find out the mistakes and correct them. 找出错误并改正。
( ) 1. Your answer are not right.
A B C
( ) 2. After I go to school, I always have breakfast.
( ) 3. Danny doesn't have some food.
( ) 4. That's fifteen dollars to the swimsuit.
( ) 5. Do you like this one and that one ?
胰腺癌的组织类型,最常见的是()
A.纤维细胞腺癌
B.多形性腺癌
C.腺泡细胞癌
D.黏液癌
E.导管细胞癌