Polyurethane elastomers based on glycols ( PEA, PPG PTMG ) , diisocyanate ( TDI ) and chain extender ( E - 300 ) were prepared.
以多元醇 ( PEA, PPG,PTMG ),PDI, E300为原料,制备了 PU 弹性体.
互联网
Objective To probe into the feasibility in diagnose of renal artery stenosis with simple harmless methods.
目的研究能量多普勒显像(PDI)在中型动脉的显示效果,探讨超声无创性诊断肾动脉狭窄的可能性.
互联网