A.△y>dy>0
B.△y<dy<1
C.△y<dy<-1
D.△y>dy<2
[单选题]A.△y>dy>0B.△y<dy<1C.△y<dy<-1D.△y>dy<2
[单选题]A.△y>dy>0B.△y<dy<1C.△y<dy<-1D.△y>dy<2
[单选题]A.△y>dy>0B.△y<dy<1C.△y<dy<-1D.△y>dy<2
[单选题]A.△y>dy>0B.△y<dy<1C.△y<dy<-1D.△y>dy<2
[单选题]A.39B.40C.41D.42
[单选题]A.△y>dy>0B.△y<dy<1C.△y<dy<-1D.△y>dy<2