在催化裂化的分子筛催化剂中,选择性和稳定性都比较好的是( )。
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催化裂化因金属污染引起催化剂中毒可通过再生而恢复。()
A. 对
B. 错
新鲜催化剂的活性高,平衡剂的活性就高。()
A. 对
B. 错
v. to continue to do sth. despite difficulties or opposition, in a way that can seem unreasonable
A. passive
B. margin
C. overlook
D. persist
n. the time at which something is supposed to begin;
A. outlet
B. meadow
C. mystery
D. outset