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【简答题】
How many things can you see in the night sky? A lot! On a clear night you can see the moon, some planets, and thousands of sparking stars. You can see even more with a telescope. You might see that many stars look larger than others. You might see that some stars that look white are really red or blue. With bigger and bigger telescopes you can see more and more objects in the sky. And you can see those objects in more and more detail. But scientists believe there are some things in the sky that we will never see. We won’t see them with the biggest telescope in the world, on the clearest night of the year.That’s because they’re invisible . They’re the mysterious dead stars called black holes. You might find it hard to imagine that stars die. After all, our sun is a star. Year after year we see it up in the sky, burning brightly and giving us heat and light. The Sun certainly doesn’t seem to be getting old or weak. But stars do burn out and die after billions of years. As a star’s gases burn, they give off light and heat. But when the gases run out, the star stops burning and begins to die. So next time you look up at the night sky, remember: there’s more in the sky than we can see! 小题1:On a clear night we might see things except______. A.the moon B.some planets C.sparkling stars D.the sun 小题2:How can we see even more in the sky? A.By using a telescope B.By using a microscope C.By climbing up to the top of a mountain D.By going outside on a clear night. 小题3:What does the underlined word”invisible”mean in Chinese? A.看不见的 B.听不见的 C.摸不着的 D.无形的 小题4:When a star’s gases_______,the star begins to die. A.burn B.run out C.give off heat D.get weak 小题5:Which of the following is NOT TRUE according to the passage? A.We might see that many stars look larger than others with a telescope B.We might see that some stars that look white are really red and blue with a telescope. C.We can see some objects in more and more detail with bigger and bigger telescopes. D.The sun certainly seems to be getting old and weak.
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举一反三
【判断题】原子吸收分光光度法可测定食品中的钙、铁、锌、铜的含量。
A.
正确
B.
错误
【判断题】在确定需要经过加工的材料存货的可变现净值时,需要以其生产的产成品的可变现净值与该产成品的成本进行比较,如果该产成品的可变现净值高于其成本,则该材料应当按照其成本计量。 ( )
A.
正确
B.
错误
【单选题】( )指为了达到项目目标,对项目的策划(规划、计划)组织、控制、协调、监督等活动过程的总称。项目管理的对象是项目,项目管理者是项目中各项活动的主体本身。
A.
施工项目
B.
项目管理
C.
建设项目
D.
施工项目管理
【简答题】项目管理是指为了达到项目目标,对项目的策划、组织、控制、协调、()等活动过程的总称。
【简答题】1/v 对1/[S]的双倒数作图得到的直线斜率为1.2×10 -3 min,在1/v轴上的截距 为2.0×10 -2 mL• min·nmol -1 。 计算Vmax和Km。
【单选题】一酶促反应1/V对1/[S]作图得到一条直线。在某一抑制剂存在时可得到第二条直线,它在1/V轴上与第一条直线相交。下列描述哪项是正确的
A.
该抑制是非竞争性抑制
B.
底物与抑制剂分子对酶的同一部位都有亲和力
C.
抑制剂与底物分子对酶结合位点完全不同
D.
抑制反应的双倒数直线位于未抑制反应的双倒数直线下面
E.
该抑制是不可逆的
【单选题】在设计阶段,双击窗体的任一空白处,打开的窗口是( )。
A.
立即窗口
B.
代码窗口
C.
工具箱
D.
属性窗口
【简答题】分别用while和do-while实现求1+2+3+...+100的和。
【简答题】1/v对1/[S]的双倒数作图得到的直线斜率为1.2×10 -3 min,在1/v轴上的截距为2.0×10 -2 mL• min·nmol -1 。 (1)写出米氏方程; (2)写出米氏方程的双倒数方程; (3)计算V max 和K m。
【多选题】为什么要用双倒数作图法而不是直接用米氏曲线来求米氏常数?
A.
在米氏曲线中,只能接近Vmax而无法真正达到Vmax,Vmax是一个近似值
B.
根据Vmax/2求得的Km也是一个近似值,不准确
C.
采用双倒数作图法即以1/v对1/[s]作图得到一条直线,根据横轴上的截距-1/Km,纵轴上的截距1/Vmax,即可求得Km和Vmax
D.
米氏曲线是一条平行于X轴的直线
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