问题
选择题
You'd better ______ her number in the phone book. [ ]
A. look into
B. look for
C. look up
答案
答案：C
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You'd better ______ her number in the phone book. [ ]
A. look into
B. look for
C. look up
答案：C
A-+H+。将1.0 mol HA分子加入水中制得1.0 L溶液,下图中,表示溶液中HA、H+、A-的物质的量浓度随时间而变化的曲线正确的是( )