U甲:U乙=1:3;断开开关 S ,拆去电压表,并在甲、乙两处分别接入电流表,此时I甲:I乙是( )
Tom and his sister ______ to the barbecue last Saturday.They were very happy.
____的小路 ____的公路 ____的天山
____的雪莲 ____的天安门 ____的升旗仪式
(Ⅰ)求不等式 f(x)≥2 的解集;
(Ⅱ)设函数 f(x) 的最大值为M,若不等式 x2+2x+m≤M 有解,求m的取值范围.
Smoking is bad ________ health.