【建筑】利用吸力运土或挖土

unweighted pair-group method using anarithmetic average

making magnesium-treated cast iron using master alloys

combination of different types of cyclones using free vortex flow

fluid circulation in refrigeration machines using osmosis

aircrafts using in flight the features of both aeroplane and

clamping connection using toggle

pulse generator using multi-aperture magnetic cores

semipermeable, membrane separation using semipermeable membranes