由①得,3x+x≥-2;
4x≥-2,
x≥-12;
由②得,x≤2;
所以不等式组的解集为-12≤x≤2.
Duty is an act or a course of action that people _____ you to take by social customs, law or religion. [ ]
A. persuade
B. request
C. instruct
D. expect
椎基底动脉血栓形成不出现以下哪个症状()
A.眩晕
B.眼球运动障碍
C.吞咽困难
D.失语
E.交叉性瘫痪