Of coal, a vital resource for the steel, electric power, and chemical industries, there are enough to last hundreds of years. ( )
A: lively
B: good
C: forceful
D: essential
A: lively
B: good
C: forceful
D: essential
举一反三
- Heat energy and energy are the middle processes of energy transformation in an electric power plant. (chemical / mechanical)
- Good financial accounts are vital to the success of any enterprise. A: total B: stable C: essential D: able
- 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%
- Canada's early economic development was founded on ___ ____ . A: resource industries B: heavy industries C: light industries D: manufacturing industries
- (10分)This heater consumes _______________ that one does. A: greater twice electric power B: electric power twice as great as C: twice as great electric power as D: twice greater electric power