共 50 条
- [31] PRELIMINARY ESTIMATION OF OPERATING COSTS INDUSTRIAL AND ENGINEERING CHEMISTRY, 1951, 43 (10): : 2304 - 2306
- [32] ECONOMICS OF EQUIPMENT OPERATING COSTS PULP AND PAPER MAGAZINE OF CANADA, 1971, 72 (05): : 40 - &
- [33] OPERATING COSTS OF INSTITUTION - REPLY RADIO AND ELECTRONIC ENGINEER, 1978, 48 (05): : 263 - 263