狠狠撸

be dial indicator micrometer bell gauge linear measurement angular measurement mechanical gtu enginering e.g. loci and curve engineering graphics plane projection of solid projection of plane section of sold engineering curves isometric projection projection of sectional orthographic line loci orthographic projection characteristic curves power centrifugal pump pump selection ppt cavitation mixed engineering fluid axial efficiency priming radial cavity npsh impeller centrifugal velocity pump vernier caliper depth gauge sine bar projection of line