例句與造句

1. The density of its field emission catelectrode tip is about 24000tip / mm2 , the onset emission voltage is 0 . 5 ~ iv , the backward voltage is larger than 25v , the current of single tip is 0 . 2na , the sensitivity is 98 . 5mv / bar
   其場致發(fā)射陰極錐尖陣列密度達24000個mm ~ 2 ，起始發(fā)射電壓為1 5v ，反向電壓25v ，當正向電壓為5v時，單尖發(fā)射電流為0 . 2na ，壓力靈敏度為98 . 5mv bar 。
2. It's difficult to find backward voltage in a sentence. 用backward voltage造句挺難的