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doing, yesterday, at this moment, you, what, were _____________?
1年前
___________,子无良媒。将子无怒,秋以为期。(《诗经•氓》)
1年前
已知5x=3y,那么x和y成______比例;已知5:x=y:3,那么x和y成______比例
1年前
Lily succeeded,for she had made a great________and got over plenty of difficulties. [ ]
1年前
在场强为E的匀强电场中有A、B两点,AB连线长L,与电场线夹角为α。则AB两点的电势差为( )
1年前