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Chemistry tutorial-Ch61-5C-Test for >C=O in carbon compounds
Chemistry tutorial-Ch61-5A-Test for >C=C<, -OH in carbon compounds
Chemistry tutorial-Ch61-3-Test for anions
Chemistry tutorial-Ch61-2-Test for cations
Chemistry tutorial-Ch61-1-Preliminary test for substances
4S Math - 6.1+6.3 solve quadratic equation
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YU CHUN KEUNG MEMORIAL COLLEGE