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2026年九年级化学质量守恒定律专项训练(电子版可打印)

  • 2026-11-15 06:41:36
2026年九年级化学质量守恒定律专项训练(电子版可打印)

质量守恒定律本身只有一句话，用起来却有九种形态。这份重难点专练把它的应用拆成九个类型：解释现象、判断物质种类、推断组成元素、定量求化学式、确定质量比、密闭容器数据分析、微观模型图，最后以综合题收尾。覆盖学生从 “背结论” 到 “用规律” 的过渡期，可作第五单元第二轮强化。

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  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001100s ]
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  6. SELECT * FROM `set` [ RunTime:0.000314s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000776s ]
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  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000390s ]
  11. SELECT * FROM `article` WHERE `id` < 548454 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000462s ]
  12. SELECT * FROM `article` WHERE `id` > 548454 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000365s ]
  13. SELECT * FROM `article` WHERE `id` < 548454 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000550s ]
  14. SELECT * FROM `article` WHERE `id` < 548454 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000927s ]
  15. SELECT * FROM `article` WHERE `id` < 548454 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000902s ]
0.086901s