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

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