The coal pitch spheres were produced from the coal pitch by suspension method.

以煤瀝青為主要原料采用水浴懸浮法制備瀝青球91自拍第1页。

Coal tar pitch and petroleum pitch were prepared from petroleum residues and coal tar by air blowing respectively.

分別以煤焦油為原料在300℃空氣氧化120min～480min和以石油渣油為原料在220℃空氣氧化300 min～720 min尤物性爱视频免费看，制備了一系列具有相近軟化點的煤焦油瀝青和石油瀝青亚洲色B色色。

Coal tar pitch and petroleum pitch were prepared from petroleum residues and coal tar by thermal reactions respectively.

分別以煤焦油為原料老外特级毛片免费的，在430℃熱縮聚50min～270min和以石油渣油為原料在 310℃熱縮聚130 min～370 min一级性生活XX视频，制備了一系列具有相近軟化點的煤焦油瀝青和石油瀝青看欧洲黄片儿。

In view of domestic coal tar based pitch and actual existing problems,describes the modified pitch process and technique in about ten commercial units which were developed by ACRE,constructed and commissioned in China recently.

根據(jù)國內煤焦油瀝青產量和存在的現(xiàn)實問題，介紹了由鞍山焦化耐火材料設計研究院開發(fā)并投產的近十套工業(yè)裝置的改質瀝青工藝技術国产激情视频一区二区三区。

It was shown from the result that the top line of pitch,pitch range,duration are important cues for stress perception.

研究結果表明日韩成人资源在线观看，音高高線国产99机热在线精品、調域、音長是表達重音最重要線索AAAα黄色视频，利用這些線索能有效地實現(xiàn)對重音的自動感知高清在线中文字幕一区。

The word line pitch is about 1.5F, while the digit line pitch is about 3F.

所述字線間距為約1.5F，而所述數(shù)字線間距為約3F自拍高潮日韩在线观看。

This method could not only applied to outer noncircular gear with all convex pitch line but also applied to outer noncircular gear with partial concave pitch line and inner noncircular gear.

這種磨削原理不僅可以應用于節(jié)曲線外凸的非圓齒輪国产第三页，而且可以應用于磨削帶內凹節(jié)曲線的外非圓齒輪及內非圓齒輪。

At the same time, the essential motion in the gear grinding process and the structure of gear grinding CNC has been discussed. This method could not only applied to outer noncircular gear with all convex pitch line but also applied to outer noncircular gear with partial concave pitch line and inner noncircular gear.

把成形砂輪看作插齒刀的一個刀齒亚洲中文偷拍，就可以利用非圓齒輪插齒加工過程中齒廓成形原理一级性爱c，推導出非圓齒輪齒廓的成形砂輪展成磨削方法，同時討論了按這一原理磨齒時需要的運動及數(shù)控機床結構日韩在线成人不卡毛片视频。

In curve fitting, the speed-flow rate curve shows that the curve of 16mm pitch wheel is a line and that of 12mm pitch wheel is a down-winding curve, the speed-pressure curves of two pitches both are up-winding curves and in the resistance-flow rate curves the curve of 12mm one has lower slope than that of the 16mm one.

曲線擬合結果顯示中国产精品国产三级，在轉速-流量曲線中，16mm螺距葉輪為一直線黄色视频免费网站在线看，12mm螺距的葉輪為一向下彎曲的曲線真人黄色视频免费的；轉速-壓力曲線顯示兩者都是向上彎曲的曲線；阻力-流量曲線顯示12mm螺距的葉輪斜率較小男女视频在线一区免费观看。

When No. 3 oil is used, put in 3000rpm, 8. 59Nm, the gear surface has an obvious plastic flow, an obvious groove is found on pitch line of the driving gear , an obvious edge is found on pitch line of the driven gear . The operating surfaces of both driving gear and the driven one is high in smooth finish, no pitting. Through the analysis on the gear surface only based on the gear in experiment with No.

實驗的結果為：ISOVG68機械油作潤滑油時成年av天堂首页，在輸入3000rpm，5.96Nm時婷婷视频一级，齒面發(fā)現(xiàn)沿節(jié)線出現(xiàn)大面積的點蝕我和子的性关系视频免费，且齒面有塑性變形；以3#油為潤滑油時黄片免费精，在輸入3000rpm黄色羞羞网站，8.59Nm時，齒面發(fā)生了明顯的齒面塑性流動欧美BBW操操操，主動輪在節(jié)線處出現(xiàn)明顯的溝槽干人网站视频，從動輪在節(jié)線處出現(xiàn)明顯的棱脊，大小齒輪工作齒面均十分光潔国产一区黄视频，未發(fā)現(xiàn)點蝕現(xiàn)象發(fā)生日韩网红美女主播自拍视频网站。