适当提高占空比有利于减少气孔数量。
Moderate increase of the duty ratio is benefit to the reduction of porosity.
结果表明，塑料薄膜厚度、通气面积、通气孔数量是影响枣果失重的主要因素。
The results showed that, the thickness of film, ventilate area, and number of ventilate hole were important factors of effecting jujube weight loss.
结果表明，在一定的激光功率下，提高焊接速度可减少金属蒸气的形成，从而降低气孔数；
We find that the pore number will be reduced through depressing metallic vapour if welding speed is increased with constant laser power.
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