grade of difficulty level
grade of difficulty level
难度等级
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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TK908DH well was an deepest well with dual lateral, and the difficulty of drilling run up to international grade scale TAML4 level.
TK 908dh井是目前国内完成最深的双分支井，施工难度达到国际分级标准TAML 4级。
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