radio tube 是什么意思

	1.	In a radio tube there is a source of electrons . 在电子管中，有一个电子发射源。
	2.	At present , china government import about 15 - 20 th558 radio tubes every year , each tube is 700 , 000rmb 目前,我国每年需进口th558发射管15 ~ 20只,每只进口的价格约为人民币70万元。
	3.	Meixing electronics factory is major in the vacuum tube stereo power amplifier , which is located in the nanhai city ， owned a workhouse over 1300 square meter , with five plant , they are box , seal and transformer circling 、 debugging & check , we also have the machine process , such as milling machine 、 punch 、 drill press 、 electric welding 、 matrix 、 incision machine , and radio tube test machine . we have realize the product line manufacture , the monthly whole output is over 200 sets 美星电子是一个专业制造真空管身历声功率放大器的加工厂，位于广东南海市黄岐工业区，拥有厂房一千三百平方米，工厂分机箱加工、焊接组装、变压器绕制、煲机老化、调试检测五个车间，机械加工设备拥有铣床、冲床、创床、钻床、电焊、模具制作、切割等二十多台，电子管及整机检测调试仪器十馀台，该厂实现了配套设备、流水作业，每月可生产胆机二百台以上，可谓中国专业生产胆机最大规模的工厂。

radio tube是什么意思