举一反三
- Congo is accused of ______. A: smuggling diamonds B: trading in smuggled diamonds C: trading in fake diamonds D: producing fake diamonds
- In mining industry, “black diamonds” are （ ）.
- What's right about the general properties of crystal? A: If there are anions in a crystal, there must be cations B: If there are anions in a crystal, there must be cations C: There are not necessarily chemical bonds in molecular crystals D: There must be no covalent bond in the ionic crystal
- In the “imitation lag” hypothesis,
- An ionic crystal consists of cations and anions, therefore, the ionic crystal can conduct electricity.
内容
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在Scopus数据库的高级检索中，检索期刊名称中包含"polymer",同时论文题目中含有"crystal"的文献，正确的检索式为： A: SRCTITLE(polymer) and TITLE(crystal) B: SRCTITLE=polymer and TITLE=crystal C: polymer wn journal and crystal wn ti D: polymer/st and crystal/ti
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knockoff=n.an unauthorized copy or imitation
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The sequence of reagents used in Gram staining is () A: Safranin solution → iodine solution → alcohol →<br/>crystal violet B: crystal violet → alcohol → iodine solution → Safranin<br/>solution C: Crystal violet → iodine solution → alcohol → Safranin<br/>solution D: Safranin solution → alcohol → crystal violet → iodine<br/>solution E: Safranin solution → crystal violet → iodine solution →<br/>alcohol
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Why don’t De Beers produce more diamonds A: They are not able to produce faster. B: They want to keep price down. C: They made diamonds scarce to keep them desirabl
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India is the world’s largest _________ and _____________ of diamonds while Russia is the largest ___________.