1) first pregnancy
初次妊娠
2) first weighting
初次来压
1.
Study on load transmitting factor of thick sandy soil on key roof stratum during first weighting in shallow seam;
浅埋采场初次来压顶板砂土层载荷传递研究
2.
The first weighting of the main roof is the very fierce ground behaviour.
老顶初次来压是一种十分剧烈的矿山压力显现现象,多数情况下,工作面来压最猛烈、最难控制的是老顶的初次来压。
3.
Combined with the geological conditions,theoritical prediction of first caving distance,first weighting in old roof and circular weighting distance are made,which is coincided with mining practice and effectively supply a guidence for the mining in 88101 face of Kangjiatan mine.
结合康家滩矿 8号煤层 8810 1工作面地质采矿条件 ,进行了直接顶初次垮落步距、老顶初次来压步距和周期来压步距的理论预测 ,与实际开采实践基本吻合 ,有效地指导了康家滩矿首采 8810 1工作面的初采实
3) primary migration
初次运移
1.
Solvent swelling: A new technique for oil primary migration;
溶胀——研究石油初次运移的新途径
2.
Quantitatively evaluating hydrocarbon primary migration by mudstone compaction dynamic analysis;
泥岩压实动态分析法定量评价石油初次运移
4) initial pressure
初次来压
1.
With the study on the moving law of the surrounding rocks in the seam mining processing of the fully mechanized coal mining face in 4-2 seam of Fengshuigou Mine,the paper understood the initial pressure and the periodical pressure distance of the 4-2 seam roof pressure,the support strength of the hydraulic supports in the coal mining face,the stress variation and stress a.
综采工作面矿压显现规律对矿山生产实践具有深刻的指导意义,文章通过对石场煤矿4-2煤层综采工作面围岩在煤层开采过程中的移动规律进行研究,掌握了4-2煤层顶板初次来压和周期来压步距、工作面支架支护强度、围岩破坏活动过程煤壁中应力变化大小和应力影响范围。
5) first roof caving
初次放顶
1.
Technology and control of first roof caving in coal working face;
采煤工作面初次放顶的技术与管理
2.
Practice of first roof caving technology at comprehensive mechanical mining face in steep thick coal seam;
急倾斜特厚煤层综放工作面超段高初次放顶的实践
6) first weighting
初次采压
参考词条
补充资料：醋酸妊娠烯醇酮 醋酸妊娠双烯醇酮
分子式：C23H32O3
分子量：356.51
CAS号：979-02-2
性质：白色结晶性粉末，无异嗅、无气味，在空气中稳定，易溶于乙醇、甲醇，不溶于水。
制备方法：可用薯蓣皂素经开环、乙酰化、氧化、水解、消除数步反应制得。
用途：可的松醋酸酯、氢化可的松、己酸孕酮的中间体。
分子量：356.51
CAS号：979-02-2
性质：白色结晶性粉末，无异嗅、无气味，在空气中稳定，易溶于乙醇、甲醇，不溶于水。
制备方法：可用薯蓣皂素经开环、乙酰化、氧化、水解、消除数步反应制得。
用途：可的松醋酸酯、氢化可的松、己酸孕酮的中间体。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。