What was used to power the water pump on the Joe Ross？A．Gas.B．Horses.C．Steam motor.D．Oil m

The Hoover Dam was the way to provide power and water to dry regions in the east Amer

What is the function of an engine’s stationary parts？A.To add power to the engineB.To keep

Which country took the lead in making use of tidal currents to produce power in 2003？A．The

The second paragraph uses facts to develop the idea that ______ .A．a plant needs more wate

What will be used to power cars in the next few decades？A．Synthetic fuel.B．Solar energy.C．

What was salt used to do in Egypt thousands of years ago？A．To punish people who had broken