Standard practice for design and manufacture of reciprocating spark ignition engines for unmanned aircraft systems .
无人飞机系统用往复式火花点火式发动机的设计和制造的标准实施规程。
Part 2-11 : particular requirements for sabre saws and double blade reciprocating saws .
第2-11部分:战刀形手持电动锯和双面往复式锯的特殊要求。
Specification for dimensions of housings for hydraulic seals for reciprocating applications .
往复运动的液压密封件壳体的尺寸规范。
Make the electromagnet attached and fixed to the sheet iron through magnetizing to produce the friction force in the reciprocating motion .
充磁,使电磁铁吸附在铁板上,产生之后往复运动时的摩擦力。
Investigators found a bloody reciprocating saw on the bedroom floor and a hatchet , which was still wet , seemingly fresh from a wash , atop an upper shelf in the kitchen , according to the herald .