This picture is beautiful than that one. [ ]
A. much
B. more much
C. much more
D. very
答案:C
计算题:
取200m1试样进行蒸馏,馏出液采用100m1容量瓶进行吸收定容,再取50.0m1的馏出液用0.0102mol/L硝酸银标准液滴定,消耗硝酸银标液4.32m1,空白消耗硝酸银标液0.25ml,问废水中氰化物的含量是多少?(氰离子的摩尔质量为52.04)
我国南方为害较重的蝼蛄是()
A.东方蝼蛄
B.华北蝼蛄
C.普通蝼蛄
D.台湾蝼蛄