单项选择题
A.节省B.受热均匀C.镀液均匀D.防止料液沉淀
A.100:15B.100:20C.100:25D.100:30
A.涂-1杯粘度计B.涂-4杯粘度计C.涂-7杯粘度计D.涂-10杯粘度计