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

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