过抛物线y2=4x的焦点F且斜率为k(k>0)的直线交抛物线于A、B两点,若AF

题型:选择题

问题:

过抛物线y2=4x的焦点F且斜率为k(k>0)的直线交抛物线于A、B两点,若
AF
=4
FB
,则斜率k的值为(  )
A.1B.2C.
2
3
D.
4
3
考点:圆锥曲线综合
题型:选择题

下图所示为我国经济格局模式图。读图回答下列各题。

小题1:图中字母代表的地理事物,正确的是(   )

①M城市代表上海           ②d包括京广、兰新等铁路 

③N城市代表武汉           ④c可能是长江,也可能是黄河

A.①②

B.②③

C.①④

D.③④小题2:关于我国经济格局模式图的正确叙述是(   )

① b经济带的发展是因为劳动力资源丰富 ② 经济最发达的是b经济带 

③ d经济带矿产资源、能源丰富 ④ a经济带技术指向型工业发达

A.①②

B.②④

C.①③

D.③④

题型:选择题

泻下作用峻烈的是( )

A.大黄
B.酒大黄
C.熟大黄
D.大黄炭
E.清宁片

题型:选择题

Computers will become more advanced and they will also become easier to use. Improved speed recognition will make the operation of a computer easier. Virtual reality(虚拟现实), the technology of(1)with a computer using all of the human senses, will also contribute to better human and computer(2). Other, exotic(奇异的)models of computation are being developed, including biological computing that uses living organisms, molecular computing that uses molecules with particular(3), and computing that uses DNA, the basic unit of heredity(遗传), to store data and carry out operations. These are examples of possible future computational platforms that, so far, are limited in abilities or are strictly(4). Scientists investigate them because of the physical limitations of miniaturizing circuits embedded in silicon. There are also(5)related to heat generated by even the tiniest of transistors.

空白(2)处应选择()

A.interfaces

B.behavior

C.similarities

D.comparison

题型:选择题

CRH2型动车组车轮擦伤长度大于等于60mm时,限速为()。

A.≤120Km/h

B.200Km/h

C.160Km/h

D.不限速

题型:选择题

炉前泥炮均有转炮、()、打泥三部分。

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