在SCI E数据库中检索废水中苯酚的降解研究，最佳检索式为： A: ts=(("waste water" or wastewater) and degradat*) B: ts=(("waste water" or wastewater) and phenol and degradat* and stud*) C: ts=(("waste water" or wastewater) and phenol and degradat*) D: ts=(phenol and degradat*)

Which of the following compounds is the most acidic？ A: phenol B: p-cresol C: p-nitrophenol D: benzyl alcohol

Which of the following methods is commonly used for total carbohydrates determination？ A: Phenol-sulfuric acid method B: DNS method C: Muson Walker method D: Somogyi- Nelson method

在下列塑料中,属于热固性塑料的是(<br/>)塑料。 A: PVC B: PE C: phenol<br/>formaldehyde D: PP

50. ___ A: They are newer than the formations in most caves. B: They were formed by sulfuric acid. C: They have been artificially preserved. D: They are smaller than those in any other cave.

Which of the following chemicals should not be stored for more than one year, and if exposed to air, peroxides can form when exposed to light A: Ethanol B: Tetrahydrofura C: Ether D: Phenol

When fuel enters the crankcase of a diesel engine, it （） A: dilutes the lube oil and reduces its viscosity B: forms sulfuric acid in the lube oil C: causes pitting and failure of the bearings D: causes sludge deposits on valve stem