精英家教网 > 高中英语 > 题目详情

Given BC=1,in a triangle(三角形)ABC, then the range of length of the side AB (or AC) is_____________________。
练习册系列答案
相关习题

科目:高中英语 来源:2011-2012学年河北省高三第三次调研考试生物试卷 题型:选择题

全能干细胞能够让植物在整个生命周期中产生新的器官,是植物生长发育的源泉和信号调控中心,但是到目前为止,人们对于干细胞组织中心建立和维持的机制仍然知之甚少。中国科学院遗传与发育生物学研究所的李传友课题小组发现了一个在植物根尖干细胞维持中起重要作用的基因,这一研究结果于2010年11月3日作为封面文章发表于国际著名杂志The   Plant  Cell上。下列说法不正确的是(    )

A.植物全能干细胞分化形成不同组织细胞是基因选择性表达的结果

B.植物全能干细胞有细胞周期,全能干细胞分化形成的导管细胞没有细胞周期

C.植物全能干细胞分化形成根、茎、叶的过程一般是不可逆的

D.植物全能干细胞分化形成根、茎、叶的过程体现了细胞的全能性

 

查看答案和解析>>

科目:高中英语 来源: 题型:

error:the file failed to load!

查看答案和解析>>

科目:高中英语 来源: 题型:阅读理解

For the past six weeks I have been having online writing classes. I had never taken an online class before, so I did not know what to expect. Now I am about halfway through the courses, and I am doing three courses, where I am practicing writing.

These creative writing classes have been somewhat similar to those I took in a middle school. There are weekly readings where we have to discuss our thoughts, and we comment on each other’s work. But there are some differences. In my middle school, I had one novel writing class where we all sat in a circle twice a week and discussed each other’s work. Each person had a copy of the story but the author of the story was always anonymous(匿名的). This allowed people to give honest opinions since there was no face to connect the story to.

The creative article course is held in a computer lab and all of our work is done online. Every week, two people read their stories aloud to the class, and then we spend a few minutes discussing them, and then post comments on the online discussion board. Still, the main benefit of an online class is that I can choose when to turn in my homework. This allows me to choose how to manage my time.

 I think taking three creative writing courses at one time may have been a little too ambitious, but I am studying a variety of writing styles and I think I am becoming a better writer for it.

How long do the online writing classes that the author is taking last for in total?

A. About twelve weeks.               B. About two months.

C. About six months.                  D. About six weeks

What do the author’s online classes and school classes have in common?

A. Students have classes in a computer lab.

B. Students sit in a circle twice a week.

C. Students write novels every day.

D. Students discuss their reading every week.

Why was the author of the story anonymous during the discussion?

A. Because students didn’t want their work popular.

B. Because in this way students could express their real ideas freely.

C. Because students didn’t know each other at all.

D. Because it took students less time to finish the discussion.

What is the main advantage of taking online writing classes?

A. Students needn’t have face-to-face talks.

B. Students can hand in their homework late.

C. Students can arrange their time as their like.

D. Students needn’t do any homework.

查看答案和解析>>

科目:高中英语 来源: 题型:

The books, _____ the dictionaries, must be put back where they _____.

A. included; were   B. to include; are   C. including; were   D. including; are

查看答案和解析>>

科目:高中英语 来源:2011—2012学年辽宁省瓦房店市高级中学高二上学期期末考试生物试卷 题型:单选题

2011年3月15日,《The Journal of Immunology》发表了张雁云教授关于发现 Graves病重要调控机制成果.Graves病发病原因如右图所示:患者所产生的某种抗体与Y激素受体结合,使甲状腺细胞持续激发,产生高水平X激素所致.张雁云研究发现寡核苷酸UDP能够减弱Graves病症状.下列有关说法不正确的是

A.X激素是甲状腺激素,Y激素是促甲状腺激素
B.患者代谢减弱,产热减少,兴奋性低
C.Graves病是自身免疫病,类风湿性关节炎,系统性红斑狼疮也属于此类疾病
D.UDP能减弱Graves病症状可能与UDP抑制浆细胞分泌该种抗体有关

查看答案和解析>>

科目:高中英语 来源:不详 题型:单选题


Suppose  the  least distance fron poinrs of the xurve(曲线)to the y-axis is then the velue of a is
A.B.C.orD.or

查看答案和解析>>

科目:高中英语 来源:不详 题型:单选题


Ahyperbola(双曲线)wjthvertices(顶点)(-2,5)and(-2,-3),has  an  asynptote(渐近线)that passes  the   point(2.5)  Then  an  equarionk  of  the  hyperbola  is
A.B.
C.D.

查看答案和解析>>

科目:高中英语 来源: 题型:

下面是将两个数中最大者打印出来的一段程序,请把程序补充完整.

    Input “A= ”;A

    Input “B= ”;B

    max=A

    If____________________ then

    max=B

    End if

    Print “The max is”;max

    End

查看答案和解析>>

同步练习册答案