The cliffs lapped by a_____ sea. A: crystal B: clearing C: cleared D: crystal-clear

When we describe the cliffs ,we can use the word as ___________.( ) A: crystal clear B: ever-changing C: beautiful D: cragged

After all these years, I am crystal clear about all of your tricks. So don’t even tryto ............................... me.

When you organize your communications, you should ( ). A: be crystal clear B: stay on topic C: thank you listeners D: organize and clarify ideas in your mind

Make sure that everything in your contract is ____________. I don’t want anyone to be confused. A: as hard as iron B: as good as gold C: as clear as crystal D: as heavy as lead

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

​An ionic crystal consists of cations and anions, therefore, the ionic crystal can conduct electricity.‍

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