一个处在有丝分裂后期的洋葱根尖细胞内有32条染色体,则洋葱体细胞中来自父方的染色体数和同源染色体的对数分别是[ ]
A.16和16
B.32和16
C.8和16
D.8和8
答案:D
To live a green life, we should try to save energy and produce pollution.[ ]
A. more; less
B. less; more
C. more; fewer
D. most; least
金属电阻具有()温度系数。