PPM百萬分之一是哪個單字的縮寫??

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2005-08-30 18:51:13 · 3 個解答 · 發問者 ? 7 in 社會與文化 ➔ 語言

PPM = Parts per Million (每百萬單位所含粒子數量）PPM = Pulse per Minute (每分鐘脈搏跳動數）PPM = Page per Minute (每分鐘印表機列印頁數）

2005-08-30 19:07:56 · answer #1 · answered by 菜英文 7 · 0⤊ 0⤋

是parts per million的縮寫....
一定對滴....
因為我剛上過...

2005-08-30 18:54:18 · answer #2 · answered by ? 2 · 0⤊ 0⤋

part per million
part per million

2005-08-30 18:53:52 · answer #3 · answered by Anonymous · 0⤊ 0⤋