... imperative form 祈使形式 imperative formation 祈使句变形 imperative mood 命令语气；祈使语气；命令式；祈使式 ...
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So with the application of domestic high strength steel in large spherical tank, it becomes imperative to study the formation mechanism and constitutive relationship of large petals.
因此，作为国产高强钢板应用于大型球罐的技术需求，大瓣片高强钢球罐壳板成形机理及本构关系研究势在必行。
Gamma ray spectrolog can provide many formation parameters. Calibration pits are its imperative basic device.
自然伽玛能谱测井能够提供多种地质参数，刻度模型是该项测井必不可少的基础设施。
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