例句與造句

1. The effective regeneration procedure is soaking the adsorbent 30 ~ 50h with 1 - 2 % al2 ( so4 ) 3 for activated alumina and 20 ~ 30h with 1 - 1 . 5 % naoh for bone char . studies show both activated alumina and bone char are excellent adsorbents for the removal of fluoride from drinking water . fluoride concentration below 1 . 0mg / l can be acquired easily with them and meets the requirement of drinking water standards
   對兩種除氟劑進(jìn)行的再生液與吸附劑體積比為1 : 1的再生實(shí)驗(yàn)表明：用硫酸鋁溶液對活性氧化鋁再生，再生濃度為1 2 ，再生時(shí)間為30 50h ，沖洗浸泡時(shí)間為5h效果較好；對骨炭再生，氫氧化鈉再生液濃度為1 1 . 5 ，再生時(shí)間為20 30h效果較好。
2. It's difficult to find drinking water standard in a sentence. 用drinking water standard造句挺難的