A:细胞膜与细胞壁紧密结合,不易分离
B:不易吸水胀破
C:很难得到完整的细胞膜
D:膜成分较多,提取过程繁琐
Tom Kate since two years ago, and they have had a child.
龙眼是海南常见的水果.一棵茂盛的龙眼树要结出好吃的龙眼,要经过哪个过程( )
____very ____ ____ ____ with dogs.
在等差数列{an}中,若a5=8,a9=24,则公差d=____.