... 周期性应力：cyclic stress 周期性歇火：intermittent cutting-out 周期性维护：periodic maintenance ...
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Soft cutting propagation of fine strain of wild Sorbaria sorbifolia was carried out in Jiaochen county of Shanxi under the full sunlight and automatic intermittent spraying.
在山西省交城县采用全光照自动间歇喷雾装置对野生珍珠梅优良单株进行嫩枝扦插试验。
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