7. The position vector of a particle at time t≥ 0 is
(a)ds/dt=_______(b)aT=______ (c) aN =_______(10%)
阿摩線上測驗
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7. The position vector of a particle at time t≥ 0 is(a)ds/dt=_______(b)aT=______ (c) aN =_______(10%)