设函数f(x)=x2+bx+c,x≤0bx+2,x>0,若f(-4)=f(1),

题型:解答题

问题:

设函数f(x)=
x2+bx+c,x≤0
bx+2,x>0
,若f(-4)=f(1),f(-1)=3,求b,c的值.
考点:函数的单调性、最值
题型:解答题

词语填空

in  for  however  much  stay  long  itself  begin  lead  study

Franklin D. Roosevelt was born in New York on January 30, 1882. He went to a famous high school in Massachusetts, and studied history in Harvard    小题1: three years, Roosevelt next    小题2: law(法律)and then worked in a famous New York City law firm. He entered  politics (政治) in 1910. For him, the future looked bright.    小题3:, in the summer of 1921,while having a holiday in Canada, he suddenly fell seriously ill and after that he became disabled. He was unable to walk any    小题4:. Not yet 40,he seemed finished in politics. But Roosevelt was not beaten down. Instead of    小题5: at home, he was still active in politics. He became president of the United States in 1933. He once said   小题6: his speech“The only thing we have to fear is fear    小题7:.”

Roosevelt was a man of unusual charm(魅力) , great optimism and strong will. He served  小题8:than any other president of the United States, and     小题9: the people of the United States through the hard times of the 1930s. He was in office from 1933 until his death in 1945, at the    小题10: 0f his fourth term (任期).

题型:解答题

不少溶洞里的地下河水是含有MgCl2和CaCl2的硬水。下表是某化学兴趣小组设计的软化硬水实验方案,请你一起来完成。

实验操作现象结论或化学方程式
步骤Ⅰ:取少量硬水样品于试管中,向其中滴加Ca(OH)2溶液,直到反应完全。有白色沉淀产生。MgCl2+Ca(OH)2=Mg(OH)2↓+CaCl2
步骤Ⅱ:向上述试管中滴加

       溶液,直到反应完全。

             化学方程式:

                            

步骤Ⅲ:      (填操作

名称)。

除去沉淀物。得到澄清滤液。
步骤Ⅳ:用两试管取等量的上述滤液和原硬水样品,分别滴加

       ,振荡。

盛有滤液的试管中          证明硬水已软化。
【拓展】经过上述实验后得到的软水还含有一种可溶性杂质。要得到纯净水,

可以将滤液再进行            操作。

题型:解答题

腹水量超过多少毫升时,查体可发现移动性浊音()

A.100ml

B.200ml

C.300ml

D.500ml

E.1000ml

题型:解答题

同种材料截面相同的受压构件,短的比长的承受能力大。

题型:解答题

某小区采用智能化管理,建筑设备自动化系统、火灾自动报警与联动控制系统、安全防范自动化系统、办公自动化系统、通信自动化系统等一应俱全。

建筑设备自动化系统的基本功能主要包括哪些

更多题库