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【单选题】
四甲基联苯胺(TMB)在ELISA测定中是何种标记酶的底物A.
辣根过氧化物酶
B.
碱性磷酸酶
C.
8半乳糖苷酶
D.
辣根过氧化物酶及碱性磷酸酶
E.
碱性磷酸酶及B-半乳糖苷酶
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反馈参考答案：
举一反三
【简答题】计数器具有 、 和 三种类型
【单选题】_______ I paid a visit to this scenic spot, I was deeply attracted by its beauty.
A.
Firstly
B.
For the first time
C.
The first time
D.
At first
【简答题】计数器具有加计数器、减计数器、 三种类型
【单选题】_____ I toured Jiuzhaigou, I was deeply impressed with its beautiful scenery. [ ]
A.
For the first time
B.
At first
C.
It was the first time
D.
The first time
【单选题】I always think of books with unutterable feelings, being deeply indebted to them, as I am, for the warmth they have brought me.
A.
preferred
B.
mixed
C.
profound
D.
dissatisfied
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