二价的

The practice showed that the blast furnace slags mainly consisted of melilite,cuspidine,bivalent metallic sulphide and Ce-Ca silica.

、枪晶、二价金属硫化物、铈钙硅是构高炉渣的主要矿物。

Terminalization The movement of chiasmata to the end of the bivalent arms, a process that may occur during late prophase I of meiosis.

交叉)移端：发在第一次减数分裂后，染色体交叉向二价体染色体臂的末端移动的过程。