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
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
举一反三
- An ionic crystal consists of cations and anions, therefore, the ionic crystal can conduct electricity.
- For the differences of magnetic moments of the following cations in strong and weak octahedral crystal field, which difference is the smallest? A: Mn2+ B: Fe2+ C: Co2+ D: Cu2+
- 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
- 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
- Solid<br/>materials can be classified into the following types ( ) A: Amorphous B: Polycrystalline C: Single<br/>crystal D: Mixed<br/>crystal