八名局长级官员
eight director-level officials
局长级官员
directorate grade officers
工业级七水硫酸镁
technical-grade heptahydrate magnesium sulfate
黑龙江省有色金属地质勘查七○七队
Team 707
Bureau of Nonferrous Metals of Jilin Province
Shuihua 152054
试剂级七钼酸铵
Ammonium heptamdybdate(AHM)for reagent
武汉二七长江大桥
Erqi Changjiang River Bridge in Wuhan
wuhan erqi changjiang river bridge
小清河七级水电站
Xiaoqinghe Cascade-7 Hydropower Station