消声器接纳阻抗复合消声器，消声器的接口尺寸与所接风管尺寸不异。
Impedance compound mufflers are used, the size of interface ofwhelloch should be the same as that of the air tubeconnected to.
本文提出了由一条二次曲线和与该二次曲线不共面的两条异面直线为导线，与该三导线均相交的直线轨迹是一个直纹四次曲面，并讨论了二次曲线分别为椭圆、双曲线和抛物线时，形成的曲面的形状特征。
In this paper, it is presented that the locus of a line crossedwith each of two guide lines and a guide conic not being on a commonplane is a ruled surface of fourth order.
这些是与红血球不异的矿物。
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