真核细胞核糖体的沉降系数及其大小亚基的沉降系数分别是( ) A. 80S ,60S,40S B. 70S ,50S,30S C. 80S ,50S,30S D. 70S ,40S,30S E. 80S ,60S,30S
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【简答题】完形填空。 A duck(鸭子) and a hen (母鸡) meet on the road. The duck asks the hen, ' 1 do you work?' The hen answers , ' 2 a farm. ' The duck says , Then you are a 3 . ' ' No, I'm a worker. I make eggs. What 4 ...