機械及設備，機電設備及部件，設備或複製，錄音，電視圖像及聲音錄製或重放器具，及這類製品的零件及附件, 84 Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof, 84.18 -refrigerators, freezers and other refrigerating or freezing equipment, electric or other; heat pumps, other than the air conditioning machines of heading 8415; parts thereof:, 84.18.10.00 -refrigerators, freezers and other refrigerating or freezing equipment, electric or other; heat pumps, other than the air conditioning machines of heading 8415; parts thereof: --refrigerator-freezer combinations with separate external doors , 業務, 業務