某同学用直角梯形玻璃砖做“测定玻璃砖折射率 实验如图所示∠a=∠b=90°∠c=60°他在玻璃的cd侧作难线并在该承线上插上大头针 Template




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tomski某同学用直角梯形玻璃砖做“测定玻璃砖折射率 实验如图所示∠a=∠b=90°∠c=60°他在玻璃的cd侧作难线并在该承线上插上大头针 coloring