A.1,
B.2,
C.3,
D.0
[单选题]( ).A.B.C.D.
[单选题]( ).A.B.C.D.
[单选题]A.条件(1)充分,但条件(2)不充分B.条件(2)充分,但条件(1)不充分C.条件(1)和条件(2)单独都不充分,但条件(1)和条件(2)联合起来充
[单选题]A.条件(1)充分,但条件(2)不充分B.条件(2)充分,但条件(1)不充分C.条件(1)和条件(2)单独都不充分,但条件(1)和条件(2)联合起来充
[单选题]A.扩大4倍B.扩大2倍C.不变D.缩小2倍E.缩小1倍
[单选题]A.条件(1)充分,但条件(2)不充分B.条件(2)充分,但条件(1)不充分C.条件(1)和条件(2)单独都不充分,但条件(1)和条件(2)联合起来充
[单选题]A.扩大4倍B.扩大2倍C.不变D.缩小2倍E.缩小1倍
[单选题]A.r=0B.r=1C.0<r<1D.-1<r<0
[单选题]A.r=0B.r=1C.0<r<1D.-1<r<0