法兰部件，消声器，管端闭锁或联结装置及其形成方法和装置。
Flange member, noice silencer, tube end closure or connection device, and forming method and device.
该装置由电子微量天平、消声水槽和反射靶悬吊系统组成。
It consists of an electronic ultramicrobalance, an anechoic tank and a system of reflecting target.
该装置由电子微量天平、消声水槽和反射靶悬吊系统组成。
It consists of an electronic ultramicrobalance, an anechoic tank and a system of reflecting target.
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