A:处于分裂间期的细胞数目最多
B:在显微镜视野内可以观察到二倍体细胞和四倍体细胞
C:在高倍显微镜下可以观察到细胞从二倍体变为四倍体的过程
D:在诱导染色体数目变化方面,低温与秋水仙素诱导的原理相似
My friend is ________ years old. Today is his ________ birthday.
某人沿斜坡坡度i=1:2的斜坡向上前进了6米,则他上升的高度为( )
根据句意和汉语注释,写出单词的正确形式。(1)Our English teacher has offered us some useful ____ (建议). I think it will help us a lot in our English study.(2)Here are two ____ (音乐会) tickets for you.(3)Daniel ____ (不愿) to accept my books ,which made me very sad.(4)____ (比较) this new TV set with the old one, you will see which is better.