含氮有机物在土壤中需氧条件下无机化产生的最终产物是()
A.氯化物
B.硝酸盐
C.氮
D.甲烷
E.以上都不是
参考答案:B
如图是某化工厂对海水资源的综合利用的示意图.
(1)目前国际上实用的“海水淡化”主要技术之一是蒸馏法.蒸馏法是将海水变成蒸汽,蒸汽经过冷却而得高纯度淡水,由此可判断蒸馏法是:______(填物理变化、化学变化)
(2)工业上利用电解饱和食盐水可制得重要化工产品,又称为“氯碱工业”.电解饱和食盐水的离子方程式为:______.阳极产生气体的如何检验______.利用电解所得气体制36.5%的浓盐酸100t,最少需要消耗食盐:______t.
(3)分离出粗盐的母液中含有Mg2+,从图中可看出对母液进行一系列的加工可制得金属镁.
①在母液中加入石灰乳所起的作用是:______.
②从充分利用当地海洋化学资源,就地取材,经济效益的角度考虑,生产生石灰的原料可是:______.
③电解熔融氯化镁的化学方程式是:______.
④氮气和氩是两种化学性质相对稳定的气体,都可用做白炽灯的填充气体.但工业上冷却电解无水氯化镁所得的镁蒸气时,却选择稀有气体氩.试用化学反应方程式解释不选用氮气的原因:______.
A good translator is by definition bilingual. The opposite is not ______(1) true, however. A born and bred bilingual will still need two__________(2) to become a translator: first, the skills and experience necessary for__________(3); second, knowledge of the field in which he or she will__________(4). The skills and experience for translation include the ability to write ______(5) in the target language, the ability to read and understand the_________(6) language material thoroughly, and the ability to work with the latest__________(7) and communication hardware and software.Does a born and bred bilingual__________(8) a better translator than someone who learned language B later in__________(9) There is no definite answer, but the following issues are important.__________(10), a born and bred bilingual often suffers from not truly knowing __________(11) language well enough to translate, with some even suffering from what __________(12) known as a lingualism, a state in which a person lacks_________(13) full, fluent command of any language. Second, born and bred bilinguals__________(14) don’’t know the culture of the target language well enough to_________(15) top-quality translations, or cannot recognize what aspects of the source language__________(16) its culture need to be treated with particular care, as they_________(17) in a sense too close to the language. And last, they often_________(18) the analytical linguistic skills to work through a sticky text.On_________(19) other hand, the acquired bilingual may not have the same in-depth _________(20) of colloquialisms, slang, and dialect that the born bilingual has. Also, the acquired bilingual will not be able to translate as readily in both directions (from B to language A and A to language B). Finally, born bilinguals often have a greater appreciation of the subtleties and nuances of both their languages than someone who learns their B language later in life can ever hope to have.