The colossal magneto-resistance appears at temperature close to the Curie temperature, and resistance will reduce with the temperature being increased or decreased quickly.
庞磁电阻效应总是出现在居里温度附近，偏离居里温度都会很快降低。
The result show that: natural doubling rate of pollen plant of spring wheat can be increased quickly by prolong low temperature treatment;
结果表明：延长低温处理时间可大幅度提高春小麦花粉植株的自然加倍率；
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