A.m＜n          B.m＞n          C.m≤n          D.m≥n

A.充分不必要条件

B.必要不充分条件

C.充要条件

D.非充充分非必要条件

A.A=B                         B.A＜B

C.A≤B                         D.A＞B

A.a＞b＞c                       B.a＞c＞b

C.b＞a＞c                       D.b＞c＞a

A.P=M∩(N)                   B.P=(M)∩N

C.P=M∩N                         D.P=M∪N

A.a+b+                        B.(a+b)()≥4

C.≤a+b                              D.

A.②④                B.①②              C.②③             D.①②④

（1）a_n＜p;

(2)a_n+1＞a_n.