非水碱量法测定有机碱的氢囟酸盐时应加入何种试剂消除干扰（）
A.醋酸铵
B.硝酸银
C.醋酸汞
D.硝酸
E.溴化钾
参考答案：C
M: Morning, Lily. What kept you
W: Morning, Stan. Sorry I’m so late, but you know, it’s impossible to find a parking place round here.
Why was the woman late （）
A. There was something wrong with her car.
B. She got up too late.
C. There was no parking place nearby.
D. She got lost on her way to Andrew’s home.
把12厘米长的绳子平均分成6份，每份占它的______，每份长是______厘米．
