下列可用作抑制剂的是
A.氯化钠
B.氯化银
C.硫化钾
D.溴化钾
E.碳酸钙
参考答案:D
解析:溴化钾的浓度一般为0.1~ 5g/L含量越高抑制作用越强。
Daniel was a bad mood and didn’t talk to .
A.on; something
B.with; anybody
C.in; anybody
D.in; somebody
— What is his suggestion?
— Just guess the meaning of it whenever you ________ a new word in reading. [ ]
A. come in
B. come at
C. come across
D. come about