下列哪种类型不属于以DNA为靶的诱变
A.烷化剂作用B.碱基类似物取代作用C.嵌入剂作用D.非整倍体剂作用E.对碱基结构的破坏作用
参考答案:D
单侧肺通气时V/Q比值()
A.增加
B.减少
C.通气侧等于非通气侧
D.通气侧小于非通气侧
E.正常
I have _____ money. Can you lend some to me? [ ]
A. little
B. a little
C. much
D. a lot of