外显子

题型:名词解释

问题:

外显子

考点:遗传学作物育种作物育种题库
题型:名词解释

已知二次函数y=f(x)的定义域为R,f(1)=2,在x=t处取得最值,若y=g(x)为一次函数,且f(x)+g(x)=x2+2x-3.

(1)求f(x)的解析式;

(2)若x∈[-1,2]时,f(x)≥-1恒成立,求t的取值范围.

题型:名词解释

下图为我国某区域等高线地形图,据此回答6~7题。

小题1:关于该区域地形特点叙述不正确的是                (   )

A.地势中间低四周高

B.盆地地形为主

C.位于我国地势第二级阶梯

D.山高谷深小题2:该地区以农产品为原料,最适宜发展的工业为        (   )

A.甘蔗榨糖工业

B.玉米深加工

C.鲜切花加工

D.有色冶金

题型:名词解释

涡街流量计的漩涡频率f信号的检测方法很多,现在用差压法检测较多,差压检测可通过()等变送器来实现

A、电容式

B、电感式

C、电阻式

D、压电式

题型:名词解释

股内角是指()。

A.股骨两髁关节面夹角

B.股骨干中线与内侧髁相交成之角

C.股骨两髁关节面画一线与股骨干中线画一线,在外侧相交成之角

D.骨折线与内髁相交成之角

E.股骨两髁关节面画一线与股骨干中线画一线,在内侧相交成之角

题型:名词解释

American Museum of Natural History is one of the largest natural and historic museums in the world and one of the main natural history research and education centres in the United States, set up in 1869 and located in the west of the Central Park, Manhattan District, New York. It (1) 7 hectares in its total area, (2) classical types of buildings. The (3) of ancient creatures and humanity is (4) the first place of all the museums in the world, (5) the representative samples from South America, Africa, Europe, Asia and Australia were collected, besides those from the (6) country, the United States.

In the museum, there are five kinds of exhibits, including astronomy, mineralogy, human history, and animals in the (7) times and those in modern times. There are thirty-eight exhibition halls with different (8) from 500 to 1,500 square metres. Besides these, there is a Roosevelt Memorial Hall in (9) of President Roosevelt who supported the (10) of the museum, which is also used to have a special exhibition, showing the new important (11) on natural sciences and (12) affairs and social problems, and special topics connected closely with the life of the citizens. Besides this, it is also used for avocation (13) to have all kinds of scientific activities in the laboratories, centres of natural science and centres for citizens. There are more than 10 (14) research departments mainly (15) for collection of samples, research and work of publication.

In the museum, there are (16) and sub-libraries of Aulspond ancient amniote, with about 300 thousand books and magazines (17) natural history, many of (18) are very valuable monographs for the first edition. It has published many expert books and magazines, and a large number of propaganda materials, (19) which are the two magazines, Natural History and Members of Museum that have the biggest (20) of their magazines.

2()

A.with

B.of

C.in

D.on

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