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【简答题】
成型后的催化剂基体常用的活化方法有( )和( ) 。
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】When you are having a old ______.
A.
it is always the same kind of cold that you had last time
B.
it may be the same kind of cold that you had last time
C.
it is certainly not the same kind of cold that you had last time
D.
it is probably not the same kind of cold that you had last time
【多选题】老年人心肌梗死的特点有
A.
疼痛症状不典型，以无痛型者多见
B.
部分老人可表现为牙、肩、腹等部位的疼痛
C.
并发症多
D.
死亡率高，且随增龄而上升
E.
死亡原因以泵衰竭多见
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