在对目的基因和载倒DNA进行同聚物加尾时，需采用( )。
A．逆转录酶 B．多聚核苷酸激酶C．引物酶 D．RNA聚合酶E．末端转移酶
参考答案：E
The project is one of the many government programmers improving the for the poorest increased ability to learn.
A．aiming at; condition
B．aimed at; situation
C．aiming at; occasions
D．aimed at; cases
颈椎管狭窄的CT诊断标准为正中矢状径小于（）
A.10mm
B.11mm
C.12mm
D.13mm
E.15mm
