已知函数f(x)=|x-a|-|x-5|,a>0. (I)若a=2,求f(x)≥

题型:解答题

问题:

已知函数f(x)=|x-a|-|x-5|,a>0.

(I)若a=2,求f(x)≥0的解集.

(II)若不等式f(x)≤2x的解集为[5,+∞),求a的值.

考点:绝对值不等式
题型:解答题

阅读短文,回答问题。

      One day, long ago, a little baby was born. His name was Jesus. Jesus was a special baby. Many people say

he was the son of God. When he was born, a new star shone in the sky. Three wise men saw the star. They

followed the star to Jesus. They brought the baby special gifts. They knew he was a special baby. When the

baby grew into a man, he was a great teacher. Jesus's birthday is Christmas day. We give gifts to our friends

and family at Christmas. We put stars on our Christmas trees, too.

1. Who was born long ago?

_____________________________________________________________________

2. Did three wise men see the star?

_____________________________________________________________________

3. What did they bring to the baby?

_____________________________________________________________________

4. When is Jesus's birthday?

_____________________________________________________________________

5. Do you put stars on your Christmas trees?

_____________________________________________________________________

题型:解答题

用于诊断心衰最敏感的指标是()

A.脑钠肽

B.D-二聚体

C.儿茶酚胺

D.尿皮质醇

E.C反应蛋白

题型:解答题

英国的“光荣革命”发生于()

A.1628年

B.1649年

C.1660年

D.1688年

题型:解答题

检查对乙酰氨基酚杂质,使用的试剂是

A.三氯化铁
B.硫酸铜
C.硫酸铁胺
D.亚硝基铁氰化钠
E.三硝基苯酚

题型:解答题

非特异性感染中,不应出现的病理改变是()

A.血管通透性增加、渗出增加、组织水肿

B.组织营养障碍、变性、液化、坏死

C.病灶边缘肉芽再生,长入脓腔填补缺损组织,创缘上皮生长覆盖创面

D.干酪样坏死

E.形成溃疡、窦道或瘘管

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