下图表示某些工业部门对区位因素(仅考虑原料、能源、劳动力)的依赖程度。判断图中①②③代表的工业部门分别可能( )
—As we know it's difficult to live in a foreign country.
—________ if you can't understand the language there.
(Ⅰ)求不等式|f(x)﹣3|≤4的解集;
(Ⅱ)若f(x)+f(x+3)≥m2﹣2m恒成立,求实数m的取值范围.