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问题 选择题

在一个双链DNA分子中，碱基总数为m，腺嘌呤数为n，则下列有关结构数目不正确的是[ ]

A．脱氧核苷酸数=磷酸数=碱基总数=m

B．碱基之间的氢键数为（3m-2n）/2

C．一条链中A+T的数量为n

D．G的数量为m-n

答案

答案：D

改错题

句子改错

1. She should goes to bed early.                         

               A       B      C      D

2.  If you are thirsty, drinking some water.                       

                A     B         C          D

3.  I'm so tried after running with him.                           

                 A               B       C    D

4. I like listenning to music very much.                           

       A          B     C    D

5.If you don't feel good, you shouldn't go to Lily's party.                        

               A             B                         C        D
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填空题

常见的多作用起重机械有桥式起重机、龙门起重机、（）起重机、（）起重机和（）起重机等等。
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