N the larva of a dipterous fly, Callitroga macellaria, that develops beneath the skin of living mammals often causing illness or death 螺旋蛆
Therefore, double screw compressor and worm compressor compared, in the same speed of the units inside less number of exhaust air ripple, big air flow noise.
因此，双螺杆压缩机与蜗杆压缩机相比，在相同转速下单位内排气次数少，气流脉动大，气流噪声大。
The world does not have never worn machine, no matter double screw compressor or worm compressor, in a few years, all needs to carry out the maintenance of the host.
世界上没有永不磨损的机器，无论双螺杆压缩机还是蜗杆压缩机，在若干年后，均需对主机进行维修保养。
For the involute screw surface enveloped worm indexing CAM mechanisms, the contact area was calculated.
并对渐开线螺旋面包络蜗杆分度凸轮机构的接触域面积进了实例分析计算。
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