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用化学知识解释或说明下列问题： (1)给煤炉生火时，用于引火的木柴不宜紧密地堆在一起，而应该架空放置?这样做的目的是 。 (2)食盐易溶于水，难溶于植物油；硝酸钾易溶于水，碳酸钙难溶于水；蔗糖在热水中溶解的质量比在等质量的冷水中溶解的质量多。以上事实表明与固体物质的溶解能力有关的因素是 ． (3)寒冷的冬季。人们常向公路上的积雪撒些盐，使冰雪很快融化。其原因是 。
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【简答题】反应速度达最大反应速度80%时,Km与[S]的关系为____。 1 Km =[S] 2 2 Km =[S] 3 4 Km =[S] 4 5 Km =[S] 5 Km =0.8[S]
【简答题】In what sense is the word "nature" used in the article ?
【单选题】The words of color are very active in English, and the word “ green ” is commonly associated with different things. Discuss the meanings of the word “ green ” in the following sentences and find the r...
A.
nature
B.
freshness
C.
youth and inexperience
D.
jealousy and envy
E.
environmental protection
F.
safety and permission These vegetables are green , which taste delicious. 填写选项的字母
【单选题】In the author's opinion. the word“nature”indicates______.
A.
a particular kind of thing
B.
the inherent force which influences the world
C.
the entire world itself including human beings
D.
the essential quality and character of something
【简答题】米氏方程是说明酶促反应速度与 __ __ 的方程式 , 其中 Km 的中文全称是 __ __ , Km 是酶的 _ _ 常数。 酶促反应速度( v )达到最大速度( Vm )的 80% 时,底物浓度 [S] 是 Km 的 ___________ 倍。
【单选题】"Nature" in the word "denaturalization" is not ________.
A.
free root
B.
free morphemes
C.
stem
D.
bound root
【单选题】Choose the word or phrase that is closest in meaning to the underlined part. The process gain of a system indicates the gain or signal to noise improvement exhibited by a spread spectrum system by the...
A.
by virtue of the spreading/dispreading process
B.
by processing the spreading/despreading naturally
C.
according to the spreading/despreading characteristics
D.
using the natural spreading/dispreading process
【单选题】反应速度达最大反应速度80%时，Km与[S]的关系为（）。
A.
Km=[S]
B.
2Km=[S]
C.
4Km=[S]
D.
5Km=[S]
E.
Km=0.8[S]
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