The main bearing shells often have a thin () of lead or indium to provide a layer giving protection against corrosion.
时间:2020-08-13 20:57:12 关键词:thin,have,leadThe main bearing shells often have a thin () of lead or indium to provide a layer giving protection against corrosion.
A.flange
B.flash
C.plate
D.sheet
答案解析
B
举一反三