Hammer mill （磨煤机）is used to _____________ coal before entering into the boiler.
举一反三
- Before an auxiliary boiler is shutdown for an extended period of time， the water in the boiler should have a pH value of （）.
- 27.The furnace of a oil fired boiler should be ____ before the operating burner is№
- Coal is most used for the electricity production in()and().
- Before entering an interview room, you should ask politely:__________.
- A hammer can used to build a beautiful kitchen cabinet or it can be used as a weapon of ______. A: bait B: barrel C: assault D: anchor