The American dream is most ______ during the periods of productivity and wealth generated by American capitalism.
Operating a diesel engine for prolonged periods, with a closed freshwater cooling system, at temperatures lower than the normal design temperature can cause ().
The speaker says that the periods of seismic activity are increasingly complex and may cause the earth to wobble.
A particular rocket car can travel for sustained periods at a maximum speed of 240 miles per hour. How many minutes would it take this rocket car to travel 86 miles?
There have been()periods in the development of American political parties in the United States.
Operating a diesel engine for prolonged periods, with a closed freshwater cooling system, at temperatures lower than the normal design temperature can cause ().