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42. A synchronous satellite revolves around the Earth in a circular orbit.
(A)Its acceleration is zero because its speed is constant.
(B)Its acceleration is zero because its velocity is constant.
(C)Its speed varies because its acceleration is constant.
(D)Its acceleration and its velocity are both not constant.

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難度： 非常困難


42. A synchronous satellite revolves aro..-阿摩線上測驗