发生泥石流的矿山,应建立泥石流观测站和专门的气象站。
参考答案:对
“ What is your name?” “______”
A.My name is Jim Green
B.My name is Green Jim
C.Jim Green is I
D.This is Green Jim here.
分析某生物的双链DNA,发现腺嘌呤与胸腺嘧啶之和占全部碱基的64%,其中一条链上的腺嘌呤占该链全部碱基的30%,则对应链中腺嘌呤占整个DNA分子碱基的比例是()
A.17%
B.32%
C.34%
D.50%