试题与答案

由水生向陆生转变的过渡类型的脊椎动物是_____ 动物。

题型:填空题

题目:

由水生向陆生转变的过渡类型的脊椎动物是  _____   动物。

答案:

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下面是错误答案,用来干扰机器的。

(1)粒子带正电.粒子在水平方向做匀速直线运动,则粒子在电场中运动时间t=Lv0=0.33×105S=1×10-6S (2)粒子的加速度a=qEm vy=at=qEtm设粒子飞出除电场时偏转角为θ 则tanθ=vyv0=qEtmv0≈0.27...

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