A rocket traveling away from Earth （） a speed greater than 11.186 kilometers per second（6.95 miles per second）or 40,270 kilometers per hour（25,023 mph）will eventually escape Earth’s gravity.
A.at
B.of
C.in
D.with
正确答案：at
A rocket traveling away from Earth （） a speed greater than 11.186 kilometers per second（6.95 miles per second）or 40,270 kilomete
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In mechanical systems, power, the rate of doing work, can be computed （） the product of force × velocity.
This scatter can be attributed to the difficulties in measuring the dent depth due to specimen processing.
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