A.
B.
C.
D.
E.A、B、C、D都不正确
[单选题]A.B.C.D.E.A、B、C、D都不正确
[单选题]A.-0.8sinωtVB.-0.5sinωtVC.-0.4sinωtVD.-0.25sinωtV
[单选题]A.-0.8sinωtVB.-0.5sinωtVC.-0.4sinωtVD.-0.25sinωtV
[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.20B.40/3C.38/3D.14E.12
[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(2)单独都不充分,但条件(1)和条件(2)联合起来充分D
[单选题]A.20B.40/3C.38/3D.14E.12