使用具有当代技术水平的1.3μm掩埋异质结激光器和造价低廉的匹配包层单模光纤,以565M6/s的速率,完成了75公里的无中继传输实验。终端设备是由同轴电缆传输系统的终端改装成
James had the hiccups(打嗝).rn“Stand on your head,”said Bella.“Then the hiccups will fall out.”rn“Thanks for your help,”James said.“But I think I'll try
the Yongle Bell is the largest bell in china.Experimenta study on the bell has been carriedout in two aspects:modal analysis and characterstics of bell sound.A
全球洗涤用品行业都在采取积极的可持续发展措施来应对一些突发的事件.在澳大利亚洗涤剂协会的带领下,澳大利亚洗涤用品行业也毫无例外地加入了可持续发展的行列.本报告将