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chemical change
met. 化学变化; 化学变化 (As with the chemical changes that take place in smelting iron, the reactions which produce slag are very complex. 如同炼铁时发生的化学变化一样,造渣过程的化学反应也是很复杂的。)
chemical change
: 4 phrases in 4 subjects
Agriculture1
Medical appliances1
Oil / petroleum1
Technology1