Three years earlier, researchers in Britain reported that combining streptomycin with a newer medicine, para-aminosalicylic acid, could reduce the development of drug resistance.
三年前，英国研究者报告将链霉素和另一种更新的药物——对氨基水杨酸联合应用可以减少耐药性的发生。
2
The strong acid is the active site for creaking para-diethylbenzene and ethylbenzene and it has little effect on p-isomer selectivity of disproportionation and isomerization.
强酸位是对二乙苯和乙苯裂化的活性中心，而对歧化和异构化反应生成对位异构体的选择性影响不大。
3
Catalytic nitration of toluene occurs by use of nitric acid in the presence of bentonite metal nitrates with useful para selectivities, up to a para to ortho ratio 1.0.