权威例句
ALL MODULES HAVE FLAT COVERSGorenstein injective and projective modulesInjective and flat covers, envelopes and resolventsImproved delineation of human brain tumors on MR images using a long-circulating, superparamagnetic iron oxide agentParamagnetic metal scavenging by melanin: MR imagingALL MODULES HAVE FLAT COVERSMR imaging and scintigraphy of gene expression through melanin induction.Relative homological coalgebrasGorenstein flat modulesFlat Covers and Flat Cotorsion Modules