1·The practice showed that the blast furnace slags mainly consisted of melilite, cuspidine, bivalent metallic sulphide and Ce-Ca silica.
结果表明：黄长石、枪晶石、二价金属硫化物、铈钙硅石是构成高炉渣的主要矿物。
2·A strong brittle gray toxic bivalent metallic element.
一种灰色有毒的二价金属元素坚韧易碎。
3·Objective To construct a bivalent VP1 gene vaccine against Coxsackie virus B1 and B3 (CVB1 and CVB3) and to test its immunogenicity in mice.
目的构建柯萨奇病毒（CV）B1/B3型二价VP1基因免疫质粒，并探讨其免疫原性。
1·National immunization Days (NIDs) using bivalent OPV have been conducted in May, with further supplementary immunization activities (SIAs) planned for June.
今年5月已经利用双价口服脊灰疫苗开展了全国计划免疫日活动(NIDs)，今年6月计划进一步开展补充免疫活动(SIAs)。