Chambers' voice droned, maddening as an insect around his head...钱伯斯一直在他耳边嗡嗡地说个不停,他都快疯了。Chambers' voice droned, maddening as an insect around his head.钱伯斯一直在他耳边嗡嗡地说个不停,他都快疯了。She droned on for hours about the us...
锑的百分含量由各蓄电池生产厂自己掌握.The percentage of antimony may be left to the battery manufacturer.含锑的铅较化工铅好些,由于它有更好的抗蚀性及强度.Antimonial lead is preferable to chemical lead because of its greater corrosion resistance and strength.一种蓝灰色...
讨论了采用不同的电磁多极场作为动态校正器的可能性.推导了圆形校正透镜、偏转校正场和四极、六极校正场引起的附加象差的公式.The possibility of dynamic aberration correction by using electro - magnetic multipole fields is discussed....