A:硫酸锌
B:氯水
C:氯化铜
D:硝酸钠
Little Bob did his homework and ________ TV yesterday evening.
已知关于x的不等式|2x﹣1|﹣|x﹣1|≤a.
(Ⅰ)当a=3时,求不等式的解集;
(Ⅱ)若不等式有解,求实数a的取值范围.