A. 正确 B. 错误
A. 0.0003,0.0005,0.0007 B. 0.0005,0.0007,0.0003 C. 0.0007,0.0005,0.0003 D. 0.0003,0.0007,0.0005
A. 铜基 B. 铝基 C. 银基 D. 铁基 E. 镍基