采用硫氰酸盐法检查铁盐时,所需试剂有 ()
A.盐酸
B.硫氰酸铵
C.过硫酸铵
D.硝酸银试液
E.氯化钡试液
参考答案:A,B,C
连词成句。
1. still, of, the, afraid, dark, you, are
2. with, on, go. I, sleep, to, bedroom, my, light
3. is, I'm, biggest, my, problem, too, busy, that
4. use, short, was, she, she, to, younger, did, be, when
5. lives, no, in, his, the, uncle, city, longer
化学实验操作的正确性是实验成败的关键.下列实验操作中不正确的是( )
A.
倾倒液体
B.
检查气密性
C.
过滤
D.
量取9.5ml液体