数字音频广播是21世纪的无线电广播系统。DAB is the radio system of the 21st Century.它的频率响应在整个音频范围内有所下降.Its frequency response has to be flat over the whole audio range.他们欢呼在音频方面所取得的进步.They hailed the advances audio has made....
溴化氢加成的最后一步,是负离子亲核试剂的附加.The addition of hydrogen bromide involves the attachment of an anionic nucleophile in the final step.关于加成的定向问题,可以一直追溯到自由基化学的起源.The problem of orientation of addition goes right back to the beginnin...
The interfacial shear stress is a constant proportion of the bottom shear.交界面的剪力与底部剪力之比是常数.Each half reaction responds to the interfacial potential at the corresponding electrode.每个半反应都与相应电极上的界面电势差相呼应.Interfacial tractio...
Yvonne had reorganized the kitchen, which was now orderly and gleaming.伊冯娜重新布置了厨房,经她一整, 现在一切井井有条到处铮明瓦亮.Yvonne has been giving these kinds of lessons for over a year.伊冯教授这种课程已经有一年多了.When he listened to Yvonne, he could co...