The calorific value of natural gas is about ______________ kcal/Nm3?
A. 10,000
B. 2,500
C. 25,000
D. 35,000
The calorific value of natural gas is about ______________ kcal/Nm3?
A. 10,000
B. 2,500
C. 25,000
D. 35,000