The hardness of cigarette was affected slightly by the change of tobacco rod density in certain range.
烟支密度在一定范围内变化对烟支硬度的影响不大。
In general, the speed depends on material hardness of the wear and tear, salaries rod density, the operator of the machine operating proficiency and propeller repair welding alloy used in the quality.
一般说来，磨损快慢取决于原料的硬度、薪棒的密度、操作人员对机器的操作熟练程度及修复推进器所使用的合金焊条质量。
The performance of the long tube is proved to be worse than that of the long rod with the same mass, length and density.
长管体的侵彻能力小于同长度同质量同密度的长杆体的侵彻能力。
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