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【简答题】
写出下列物质的电子式和结构式（6分） （1）O 2 电子式： ，结构式： （2）H 2 S 电子式： ，结构式： 写出下列物质的电子式 （3）NaCl 电子式： （4）MgCl 2 电子式：
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举一反三
【单选题】The fact that a rock star earns $5 million a year while a teacher earns $25,000 annually is most directly an example of an economy answering the ________ part of one of the two big economic questions....
A.
when什么时候
B.
for whom对于
C.
how怎么样
D.
why为什么
【简答题】是保证精馏过程连续稳定操作的必要条件之一。
【单选题】Choose the one that best answers the following question or completes the statement according to the text. The author refers to the fact that micro-organisms are found in alkali lakes and rock fissure ...
A.
explain some species have great vitality
B.
prove life is everywhere
C.
hint it is possible that life can be found beyond Earth
D.
show extraterrestrials really exist
【单选题】The fact that a rock star earns $5 million a year while a teacher earns $25,000 annually is most directly an example of an economy answering the ( ) part of one of the two big economic questions.
A.
"when"
B.
"for whom"
C.
"how"
D.
"why"
【简答题】(一) . 语法填空 1 . Mary is interested in biology and wants to be a ______ (biology) when she grows up. 2 . As a result of this , a great dust cloud formed in the sky __________ _______ ( 阻挡 ) the sun...
【简答题】The fact that their marriages may be on the rock, or that their love affairs have broken or even that they got out of bed on the wrong side is simply not a concern.
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