（） heat efficiency in coal-fired power generation is one way to help meet this policy goal.
举一反三
- The coal provides energy to power the (heat) （） system of hospitals.
- Which indexes are economic indexes of Rankine Cycle ( ) A: Thermal efficiency B: Coal rate C: Heat rate D: Steam rate
- Hydroelectric power plants generate in a much cleaner way than coal-fired ones. A: electric B: electricity C: electronic D: economic
- Advertising works best when it’s developed to meet one goal at a time.
- If 300g of standard coal is used for 1kW.h of electric energy in a power station, the efficiency of generating electricity is (). A: 31% B: 41% C: 51% D: 61%