發送短信

數:

提供者:

CAPTCHA:

  _____    _    _      _____   _    _     ______  
 /  ___|| | || | ||   / ___// | || | ||  /_   _// 
| // __   | || | ||   \___ \\ | || | ||  `-| |,-  
| \\_\ || | \\_/ ||   /    // | \\_/ ||    | ||   
 \____//   \____//   /____//   \____//     |_||   
  `---`     `---`   `-----`     `---`      `-`'

Please enter what you see:

發送短信 : Measurements of ion current from a corona-needle using a faraday cup electrometer