①重于秦山 轻于红毛 蜂拥而致 鱼惯而人 ____、____、____、____
②燕子去了,有在来的时候;扬柳枯了,有再青的时候;挑花谢了,有再开的时候。
____、____、____
③我不知道他们给了我多少日子;但我的手确乎是惭惭空虑了。____、____
在直角坐标系xOy中,圆C的参数方程x=1+cosφy=sinφ (φ 为参数).以O为极点,x轴的非负半轴为极轴建立极坐标系.
Last year, some groups of students in their community (社区) made a survey about “How do people spend their free time? ” The following diagrams(图表) show some results of it: Diagram (1): Hours for people of different ages who surf the Internet in a week. Diagram (2): Different days people go to the library. (library attendance)
Diagram (3): Different programs people like.
下列设备工作时,将化学能转化为热能的是( )
(Ⅰ)求f(x)的最小值;
(Ⅱ)在△ABC中,角A,B,C的对边分别是a,b,c,a=1,b=3,若f(C)=1,求△ABC的面积.