【单选题】----I didn’t do well in this English examination. How about you? ----I did _____ you.
【判断题】按维数条形码可分为一维条形码、二维条形码、多维条形码。
【简答题】正常人血中HC03-,与H2CO3之比( )。
【简答题】You'd better not leave the medicine _____ kids can get at it. [ ] A. even if B, which C. where D. so that
【单选题】某温度下,CO 2 饱和溶液的浓度是0.03mol/L,其中1/3的CO 2 转变为H 2 CO 3 ,而H 2 CO 3 仅有0.1%发生如下电离:H 2 CO 3 H + +HCO 3 — ,则溶液的pH约为( )