旧触媒利用的原则是:只允许把曾在高温段下使用过的触媒替换到低温段继续使用,绝不可相反。
参考答案:错
Rose left for school when she was seventeen and then went to a college for a year to learn type. She passed her examinations quite smooth and then went to look for work. A lot of people are looking for typists at that time, but it was not difficult to find an interesting job. Rose went to several office, and at last chose one of them. It was near his house. She thought, “ I’ll walk there every morning. I won’t need to go in bus.” She went to the office again and said to the manager, "I want to work there, but what will you pay me?"
"We'll pay you 27 pounds now, and 30 pounds after three months."
Rose thought for a few seconds, then she say, "All right, then I'll start in three months time".
下列哪项韧带的变化和腰腿痛关系最为密切()
A.棘上韧带和棘间韧带
B.棘间韧带
C.黄韧带和棘间韧带
D.黄韧带和前纵韧带
E.黄韧带和后纵韧带