“portable derrick”的概念、定义、翻译、参考文献-科学参考

单词	portable derrick
释义	portable derrick 活动井架
随便看	ultramarathon ultramarine ultramarine blue ultramarine brown ultramarine green ultra-marine trade ultramarine violet ultramarine yellow ultramatic drive ultra-matic stitch selector ultramicro ultramicro- ultramicro acervatio ultramicro analysis ultramicroanalysis ultramicro assay ultramicro balance ultramicrobe ultra-micro camera ultramicrochemistry ultramicro-crystal ultramicro crystal ultramicrocut ultramicro-earthquake ultramicroearthquake

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