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Terms for subject Environment containing 六六六 | all forms
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三氮六环triazine Azines that contain three nitrogen atoms in their molecules (分子中包含三个氮原子的二氮六环。)
第六族元素element of group Group VI consists of two subgroups: group VIb, the main group, and group VIa. Group VIa consists of chromium, molybdenum, and tungsten. The main group consists of oxygen, sulphur, selenium, tellurium, and polonium (第六族元素包含两个子族:主族6b及6a族。6a族包含铬、钼、和钨。主族6b族包含氧、硫、硒、碲、和钋。)