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【简答题】
某已知A、B均是由两种短周期元素组成的化合物，A中某元素的质量分数为25%，B的焰色反应呈黄色，C、J、X是同周期的元素的简单氢化物，X为无色液体，C、J为气体，D是一种不溶于水的白色固体。反应生成的已略去。它们有如下图所示的关系。 （1）写出化学式：A ,E ,L ； （2）在反应①②③④⑤中属于氧化还原反应的是 ； （3）反应③化学方程式为： ； （4）写出下列离子方程式：反应② ； G溶液与M溶液的反应 。
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举一反三
【简答题】What did Albert Einstein and Thomas Edison have in common?
【单选题】Who has been working at the making of the atomic bomb from beginning to end'?
A.
Albert Einstein.
B.
Harold C. Urey.
C.
Ernest O. Lawrence.
D.
J. Robert Oppenheimer.
【单选题】改革开放 40 年来,我国实践上的每一次创造,理论上的每一次突破,事业上的每一次进步,无不闪耀着实践是检验真理的唯一标准的光辉,实践之所以能够成为检验认识的真理性的唯一标准是因为()
A.
实践是一个无限发展的过程
B.
实践是人们生存发展的基础
C.
实践有联系主观和客观的特性
D.
实践是认识的来源和目的
【单选题】What did Albert Einstein and Thomas Edison have in common?
A.
They were thought to be slow learners in childhood, but they made magnificent discoveries through their hard work.
B.
They were thought to be fast learners in childhood, and they made magnificent discoveries through their hard work.
C.
They were thought to be slow learners in childhood, and they failed to make magnificent discoveries.
D.
They were thought to be fast learners in childhood, but they failed to make magnificent discoveries.
【单选题】The teacher asked the students ________.
A.
if they were interested in dinosaurs
B.
when was Albert Einstein born
C.
what they will do with the computers
D.
how many trees they have planted
【简答题】表示组合体各组成部分相对位置的尺寸称为 ,确定组合体各组成部分的长、宽、高三个方向大小的尺寸称为 。
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