1.Natural rubber comes from the milky sap of a tropical tree.
A:正确
B:错误
答案:正确
2.Furfural is exclusively produced from lignocellulosic biomass by dehydrating pentose.
A:正确
B:错误
答案:正确
3.The production of nanocellulose can help the issue of greenhouse gas emission.
A:正确
B:错误
答案:正确
4.Cellulose hydrogels can be prepared from a cellulose solution through physical cross-linking.
A:错误
B:正确
答案:正确
5.Flavonoids generally occur in plants as glycosylated derivatives.
A:正确
B:错误
答案:正确
6.When heating a liquid in a test-tube, we need point the test-tube away from other people.
A:正确
B:错误
答案:正确
7.On the basis of the cross-linking method, the hydrogels can be divided into chemical gels and physical gels.
A:错误
B:正确
答案:正确
8.The thermochemical conversion process uses heat to break down biomass into intermediates, such as gas or bio-oil that can be upgraded into fuel and other products.
A:正确
B:错误
答案:正确
9.Alkanes are unsaturated hydrocarbons.
A:错误
B:正确
答案:错误
10.Pretreatment with dilute acid has little effect on lignin.
A:正确
B:错误
答案:错误
11.Before entering the paper machine, water is added to the pulp slurry to make a thin mixture normally containing less than 5 percent fiber.
A:对
B:错
A:正确 B:错误 13.The pills and medicine we use are all made from chemicals, that are there to make our body stronger and to kill viruses and bacteria.
A:正确 B:错误 14.In some cases, momentum, heat, and mass transfer all occur simultaneously.
A:正确 B:错误 15.The basic flavonoid structure is the flavan nucleus, which consists of 15 carbon atoms arranged in three rings (C6-C3-C6).
A:错误 B:正确 16.Alcohols exhibit hydrogen bonding.
A:对 B:错 17.The separation operation called distillation utilizes vapor and liquid phases at essentially the same temperature and pressure for the coexisting zones.
A:错误 B:正确 18.Association between lignin molecules increased with increasing lignin concentration under aqueous conditions of pH 13 and 14.
A:错误 B:正确 19.In reaction with lime, the color of the juice does not change.
A:正确 B:错误 20.Momentum transfer takes place between the fluid elements which are moving at different velocities.
A:错误 B:正确 21.In the process of liquid-liquid extraction, the liquid-mixture feed and solvent are miscible.
A:错误 B:正确 22.The cellulose microfibrils only have crystalline regions.
A:正确 B:错误 23.The hydroxyl moieties on the cellulose chain were the main reactive groups.
A:正确 B:错误 24.Lignocellulosic biomass can be transformed into bioethanol via two different approaches, biochemical or thermochemical conversion.
A:错误 B:正确 25.In the laboratory, the most basic form of filtration is using gravity to filter a mixture.
A:错误 B:正确 26.Plant oils are triglycerides, tri-esters of glycerol with long chain fatty acids, with varying composition of fatty acids depending on the plant, the crop, the season, and the growing conditions.
A:错误 B:正确 27.The degree of unsaturation, which can be expressed by the iodine value (amount of iodine in g that can react with double bonds present in 100 g of sample under specified conditions).
A:正确 B:错误 28.The bleaching step is necessary in the pulping and papermaking process.
A:正确 B:错误 29.In the paper making process, the first step is refining.
A:错误 B:正确 30.The mass in gram of one mole of a compound is equal to the molecular weight of the compound in Atomic Mass Units.
A:错误 B:正确 31.The periodic table is just a common table.
A:对 B:错 32.Hydrothermal modification was universally used for lignin degradation. Frequently, some water was added to make the system more homogeneous.
A:正确 B:错误 33.When two objects at different temperatures are brought into thermal contact, heat flows from the object at the higher temperature to that at the lower temperature.
A:错误 B:正确 34.A combustion reaction is an endothermic reaction.
A:错误 B:正确 35.Esterification is possibly the easiest of the reactions to produce lignin-based polyesters that involve the hydroxyl groups of lignin.
A:错误 B:正确 36.Hemicellulose and cellulose follow the same biosynthetic routes.
A:正确 B:错误 37.Modifications on hydroxyl groups can lead to the formation of polyol derivatives of lignin.
A:错误 B:正确 38.Biochemical pretreatment is mainly used to overcome recalcitrant material and increase surface area to optimize cellulose accessibility to cellulases.
A:正确 B:错误 39.It is clear that good yield and high purity are important objectives in operating a crystallization process, but these two factors are not the only ones to be considered.
A:错误 B:正确 40.Modification of lignin prior to resin synthesis has typically been performed by reacting lignin with phenol in the presence of organic solvents such as methanol or ethanol.
A:正确 B:错误
