毎週のテーマ、正解者には5つの富を、参加者には2つの富を報酬として;第61題
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流体粒子の運動速度が流れの方向と一致する方向にのみ変化する流れを( )流れという ; 流体の粒子の運動速度が、流れの方向に垂直な方向でのみ変化する流れを( )流れという。 引張り、切断2、方向が垂直なのは:せん断流動
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