“封口盘”的概念、定义、翻译、参考文献-科学参考

单词	封口盘
释义	封口盘 Encyclopedia 工学凿井设施释 shaft cover platform封口盘凿井时，设置于井口地面上、覆盖井筒掘进直径的可承载平台。又称井盖。
随便看	fractional differential operator fractional differentiation fractional digit fractional dimension fractional distillation fractional divisor fractional drag fractional [electric] charge fractional electric charge fractional equation fractional equipment fractional equivalence fractional exponent fractional expression fractional factorial design fractional-factorial design fractional flow equation fractional Fourier transform fractional frequency fractional function fractional gain error fractional heat fractional ideal fractional independent yield fractional inequality

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