下列方程没有实数根的是 [ ] A.4(x2+2)=3x B.5(x2-1)-x

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问题:

下列方程没有实数根的是  [ ]

A.4(x2+2)=3x

B.5(x2-1)-x=0

C.x2-x=100

D.9x2-24x+16=0

考点:一元二次方程根的判别式
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试述血友病A的诊断步骤。

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基础知识检测

小题1:He recognized the offer of a job in the factory as a chance to be grabbed at without ____(犹豫).

小题2:Some people have a firm belief that online shopping will finally end up ____ store shopping in the future.(代替)

小题3:Night ____, they stopped talking about some hot issues happened these days because of darkness.(临近)

小题4:The system has been designed to give students a quick and easy ___ to the digital resources of the library.(使用的机会、通道、路径)

小题5:I would ______ if they stopped interrupting me when I was delivering a speech.(感激)

小题6:If it is __ to you, call me tomorrow before noon.(方便的)

小题7:双星是两颗星,是由相互围绕旋转的两颗星组成。

A binary star is a double star, _____ two stars turning round each other.

小题8:Parents __ much importance __ education. They will do their best to give their children that priceless gift.(使-----附着于)

小题9:The Chinese language __  __ Western languages in that it uses characters which stand for ideas, objects or deeds.(与……不同)

小题10:你被闪电击中的可能性要比受到鲨鱼袭击的可能性大两倍。

You are ______ to be hit by lightning than be attacked by a shark.

小题11: ____ physical problems, those patients also show a lot of concerns.(除了)

小题12:He expects to ____ the business when his father retires.(接管)

题型:选择题

机械性肠梗阻的病因为()

A.慢性铅中毒

B.腹膜后血肿或感染

C.肠管受压

D.肠系膜血管栓塞

E.肠功能紊乱致肠痉挛

题型:选择题

读我国某地形区的经纬度范围示意图,回答1一3题。

图4一6

小题1:图示地形区最具特色的农产品有

A.甜菜和油菜

B.冬小麦和高粱

C.大豆和甜菜

D.棉花和春小麦小题2:关于图示地区农业生产的叙述,正确的是

A.生长期长是作物产量高的主要原因

B.热量是农业生产发展的限制因素

C.平原面积广大,机械化水平高但商品率低

D.次生盐渍化导致土壤肥力下降小题3:图示地形区在土地资源的开发中,应该加强

A.红壤的改良

B.黑土的利用和保护

C.沼泽的开垦

D.土地荒漠化的治理

题型:选择题

瑞氏染液中起固定作用的是

A.美蓝
B.伊红
C.沙黄
D.甲醇
E.甘油

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