29.C,细节理解题,根据第二段"He calculated that the circumference(圆周) of the Earth was 28,600 miles(46,000 kilometers). "他计算出的地球的圆周周长是28600英里(46000公里),可知,他确信地球是圆的,故sphere是一个球体,故选C.30.B,词义猜测题,根据第二段大意可知,Eratosthenes 测算出地球的周长,可知...
He calculated that the circumference (圆周) of the Earth was 28,600 miles ( 46,000 kilometers). Actually, The true size of the Earth is 25,000miles (40,000 kilometers ).Eratosthenes's measurement was wrong, but it was very close to the truth.For many centuries after Eratosthenes lived,...
He calculated that the circumference(圆周) of the Earth was 28, 600 miles(46, 000 kilometers).The true size of the Earth is 25, 000 miles (40, 000 kilometers).Eratosthenes' measurement was wrong, but it was very close to the truth....
What is the distance between the Earth and the Sun? What is the approximate diameter of the Sun? How many planets are between Earth and the sun? How many miles does the Earth travel around the Sun in a year? How many miles is the Oort cloud from the sun?
What is the radius of the Earth, in kilometers and in miles?At ground level g is 9.8 m / s 2 suppose the earth starts to increase its angular velocity. How long would a day be when people on the equator were just thrown off.
"The Andes Mountains, 287 miles [462 kilometers] away, and although taller than the plane's altitude, lay below the sensible horizon, marked by the white horizontal line in the photograph," NASA officials wrote in adescription of the flight. "The Earth's curvature explains this phenomenon, ...
With a 172-foot wingspan and a maximum gross takeoff weight of 336,500 pounds, the bomber could perform attack missions at altitudes of 50,000 feet and had a range of 6,000 nautical miles. It could fly a total of 10,000 nautical miles—almost half the earth’s circumference—with just...
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