A:签赏 无与纶比 获益匪浅
B:戳穿 改斜归正 默守成规
C:肆虐 莫明其妙 坦荡如底
D:忌讳 不屑置辩 蔚然成阴
—Sorry, Sir. I can't remember all the new words we learn every day.
—________. Practice more.
(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.
提示BaSO4(s)⇌Ba2+(aq)+SO42﹣(aq)的平衡常数Ksp=Ba2+•SO42﹣,称为溶度积常数.