已知全集U=R,集合A={x|1≤x-1<3},B={x|2x-9≥6-3x},
求:(1)A∪B;
(2)CU(A∩B)。
解:易知,,,
(1);
(2),
∴。
Office _______ is just something that he plays at; the one thing that really interests him is golf.
A.ambition
B.enterprise
C.routine
D.Framework
阳离子表面活性剂在水溶液中形成携带()的表面活性离子。
A.负电荷
B.正电荷
C.电解质
D.阴离子