發送短信 : Onset of space charge limited current for field emission from a single sharp tip

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