a-c oil change over test 意味

• A-C oil change over test
  A-C重油切換え試験[機械]
  

• test for change in quality of fat oil:    油脂変質試験｛ゆし へんしつ しけん｝
• spare exciter change-over test:    spare exciter change-over test予備励磁機切替え試験[機械]
• oil change:    オイル交換｛こうかん｝