The enamel surface microhardness was measured by a Leitzs microhardness tester.采用维氏显微硬度仪测定经饮料浸泡后牙釉质表面显微硬度的变化.The microstructure and microhardness of ths laser nulted Fe - Sb alloys were studied.研究了激光表面熔化Fe-Sb合金的显微组织和显微硬度...
I'm not trying to beat your alibis any more than I'm trying to prove'em.我并不是不让你辩护,我只是想把那个人找出来.We had a couple of suspicious characters but their alibis are watertight.我们中有几位多疑的人,但是他们的阴谋无懈可击.Success require...
铜比铅的电阻要小.Copper has less resistance to electricity than lead.电阻的测量单位是欧姆。The electric resistance is measured in ohm.网路电阻超过230欧姆时，读数就完全不准了。When resistance in the circuit exceeds 230 ohms, the reading is not completely depe...