Reflection of a beam of light on the diaphragm falls on a phototransistor.经膜片反射的光束照射到光敏管上.A beam of light produced by a laser can weld metals.激光器发生的光束可以焊接金属.A beam of light produced a laser can weld metals.激光器发生的光束可以焊接金属...
若采取收件人付费方式, 则费用由收件人支付.For Freight Collect shipments , the charge will be billed to the consignee.如要填写邮件地址, 请点击“收件人”, “抄送人”,“密送人”, 然后点击“编写”按钮.To address a mail message, click, To , Cc, or Bcc, then click compose.此消息完全是为了指...