国际种子规程规定的种子发芽标准为()。
A、胚根、胚芽露出种皮
B、胚根伸长约为胚芽1/2
C、种子萌发长成正常幼苗
D、胚芽伸长约为胚根的1/2
参考答案:C
With your brother's help, I've made great progress in English and I really want to do something for
him _______. [ ]
A. in turn
B. by turns
C. in return
D. in answer
测定蛋白质相对百分含量可用
A.RB.TC.F、D.d(hkl)E.θ