ELISA的双抗体夹心法,固相载体的标记物是()
A.待检抗原
B.已知抗原
C.已知抗体
D.酶标抗体
E.酶标抗原
参考答案:C
The teacher had the students __________ all the words they didn’t know.
A.looked up
B.looking in
C.look up
D.look at
汤姆情妇的套间在158号大街的一排白色公寓的第()层。
A.底层
B.第一层
C.最高一层
D.各楼层