就模板DNA而言,影响PCR的主要因素是()
A.模板的数量
B.模板的纯度
C.模板的质量
D.A+B
E.A+B+C
参考答案:D
---Warren Buffett is the second wealthiest man in the world .
---He is, but___ doesn’t follow that he lives the most expensive life. Actually, he still lives in an old house that he bought 30 years ago.
A.that
B.it
C.everyone
D.anyone
下面体位姿势开始位置是仰卧地上的是()
A.蛇击式
B.骆驼式
C.拱背升腿式
D.狗伸展