The infra - red spectra of quinones present a number of interesting features.醌类的红外光谱具有一些有趣的性质.Ethylene and trans - dichloroethylene are both inactive in the infra - red in this region.乙烯和反式二氯乙烯在红外光谱的这个区域都无活性.Infra - red ...
The AA called for laws to regulate clamping firms.英国汽车协会呼吁立法，规范夹车公司的行为。Our institute is clamping down on those who often play truant.我们学院正在严加惩处那些经常逃学的学生.They are busy clamping down the deck.他们正在忙着冲刷甲板....