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%
A: 31%
B: 41%
C: 51%
D: 61%
举一反三
- Burning waste ______ energy that can be used for electric power or heating.
- Burning waste ( ) energy that can be used for electric power or heating. A: gathers B: yields C: supplies D: accumulates
- 请开始答题：<br/><br/>1，2，5，3，4，19，5，6，（）。 A: 61 B: 51 C: 41 D: 31
- 10. Burning waste ______ energy that can be used for electric power or heating. A: supplies B: accumulates C: gathers D: yields
- Coal is most used for the electricity production in()and().