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flow and pressure drop curves based on manufacturer's testin

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flow and pressure drop curves based on manufacturer's testing for diverting fittings
怎么翻译呀.尤其是pressure drop curves和diverting fitting.
flow and pressure drop curves based on manufacturer's testin
pressure drop curves 压降曲线
fittings 管道系统中用于直接连接、转弯、分支、变径以及用作端部等的零部件,包括弯头、三通、四通、异径管、管箍、内外螺纹接头、活接头、快速接头、螺纹短节、加强管接头、管堵、管帽、盲板等(不包括阀门、法兰、紧固件、垫片)
diverting fittings 这里应该转弯装置(弯头,弯管)