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={1,2,4}, ={2,3,4},则=( ) A.{2, 4} B.{1,3} {1,2,3,4}
3,2,1,4 3,2,4,1 4,2,3,1 4,3,2,1 1,2,3,4 1,3,2,4
{1,2,3,4,6} {1,2,3,4,5} {1,2,5} {1,2}
{1,2,3,4,6} {1,2,3,4,5} {1,2,5} {1,2}
={xU|x2-5x+p=0},若C.U.A.={2,3},则实数p的值为 ( ) A.4 -4 6 -6
3,2,4,1 4,2,3,1 4,3,2,1 1,2,3,4
=( ) A. {4} {3,4} {2,3,4} {1,2,3,4}
3,2,4,1 4,2,3,1 4,3,2,1 1,2,3,4
REVOKE UPDATE(salary) ON employee(U1,U2,U3) REVOKE UPDATE(salary)ON employee FROM U1,U2,U3 REVOKE UPDATE ON employee FROM U1,U2,U3 REVOKE UPDATE(salary) FROM U1,U2,U3
REVOKE UPDATE(salar ON employee(U1,U2,U3) REVOKE UPDATE(salarON employee FROM U1,U2,U3 REVOKE UPDATE ON employee FROM U1,U2,U3 REVOKE UPDATE(salar FROM U1,U2,U3
{5} {1,2,5} {2,3,4} {1,2,3,4}
={1,2,3,4}, ={x∈R.|1<x≤4},则A.∩B.=( ) A.{1,2,3,4}B.{2,4} {2,3,4} {x|1<x≤4}
={1,2}, ={2,4},则 U.(A.∪B.)=( ) A.{2} B.{3} C.{1,2,4} {1,4}
4,3,2,1 1,2,3,4 1,4,3,2 3,2,4,1
={1,2}, ={2,4},则∁U.(A.∪B.)=( ) A.{2}B.{3} {1,2,4} {1,4}
={1,2,3}, ={3,4,5},则 (A.){1,2,3,4} (B.){1,2,4,5} ( ){1,2,5} ( ){3}
3,2,1,4 3,2,4,1 4,2,3,1 4,3,2,1 1,2,3,4 1,3,2,4