单选题 1分

The symbol (GB786.1-93) at right side represents_____

  • A. check valve
  • B. pressure reducing valve
  • C. relief valve
  • D. sequence valve

你可能感兴趣的试题

1 单选题 1分
  • A. fuel pump failure
  • B. fan motor failure
  • C. increased feedwater consumption
  • D. decreased boiler efficiency
2 单选题 1分
  • A. white incandescent flame
  • B. high flame temperature
  • C. black stack smoke emission
  • D. 0% carbon monoxide level
3 单选题 1分
  • A. low water level
  • B. excessively high pressure
  • C. high water level
  • D. low oil temperature
4 单选题 1分
  • A. low water level
  • B. excessively high fuel pressure
  • C. low oil pressure
  • D. an improper air/fuel ratio