Field experiment was conducted on studying the affection on the yield of cabbage and the accumulation of nitrate by using different kinds of nitrogen fertilizer.
通过田间试验研究了不同形态氮肥对大白菜产量及硝酸盐累积的影响。
Earthquake isoseismal is usually determined based on the macroscopic earthquake affection and damages observed in the field.
地震烈度包络线通常用地面调查宏观地震影响和破坏现象来划分。
It will produce magnetic field due to affection by direct current welding power supply during the welding of spiral submerged arc welded pipe. It will still remain residual magnetic.
螺旋埋弧焊钢管焊接过程中因直流焊接电源的影响会产生磁场，焊接结束后仍有剩磁存在。
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