—No, it is only three weeks ________ they married.
A:that; since
B:that; when
C:when; that
D:since; before
给下面的字加上一部分,变成一个新字。
两—____ 干—____ 己—____
月—____ 争—____ 音—____
分式x3y与3x2y2的最简公分母是( )
①0.2mol/L的H2O2溶液,25℃;②0.2mol/L的H2O2溶液,MnO2,25℃;
③0.2mol/L的H2O2溶液,35℃;④0.2mol/L的H2O2溶液,MnO2,35℃.
We for Jack at ten last Monday. He often kept us .