结构为直螺旋，有弹头单螺、双头单螺、双头双螺三种。
Structure for the straight screw, single screw, a warhead double-helix single screw, twin screw three.
本发明涉及一种双螺带管式反应器，尤其适用于高性能聚丙烯腈基碳纤维纺丝液制备。
The invention relates to a double helical ribbon pipe type reactor, which is particularly suitable for preparing high-performance polyacrylonitrile-based carbon fiber spinning solution.
合成三种N，N＇-1，4-亚丁基双螺吡喃和双螺恶嗪光致变色化合物，通过红外光谱、核磁共振氢谱及元素分析确证其结构。
Three photochromic N, N'-1,4-tetramethylene bisspiropyran and bisspirooxazine compounds were synthesized. They have been identified by IR spectra, 1H -NMR spectra and elemental analysis;
其次，先将靛红和丙二腈缩合制备得亲偶极体后与另一分子靛红及肌氨酸进行三组分反应可以合成含有两个不同吲哚片段的双螺环化合物。
Secondly, the three components of isatin, sarcosine and dipolarophiles condensed by isatin and malononitrile were involved in forming dispiro compounds including two of different indole moieties.
用螺纹联接并起紧固作用的零件称为螺纹紧固件。常用的螺纹紧固件有螺栓、双头螺柱、螺钉、螺母、垫圈等。
Parts with threads used for joining and fastening are called screw fasteners. The most widely used components as screw fasteners are bolts, double screw bolts, screws, nuts, washers.
卧螺离心机是一种具有微小速差的双转子系统，它的不平衡振动信号是一个拍振。
The horizontal decanter centrifuge is a dual rotor system with small rotating speed difference, of which unbalanced vibration is a "beat" signal.
对称双头螺柱上的两个螺母松动力矩不对称是引起单边螺母松动的重要原因。
It is the main reason for loose of the nuts that loose torque affecting on two nuts of the double end studs is not symmetrical.
我公司有各种设备198台，主要生产全螺纹螺杆、双头螺柱、圆螺母、吊环、销类等。
My company has a variety of devices 198 Units, mainly the production of full-thread screw, double-headed stud, round nuts, rings, pin and so on.
该测试系统除了能对卧螺离心机进行现场整机动平衡，还能对单校正面和双校正面转子系统进行现场整机动平衡。
This measurement system include field balance the dual rotor system with slightly different speed, single emendation plate and double emendation plate.
螺双芴衍生物在有机电致发光领域有重要的应用价值。
Recently, spirobifluorene have great significance in the field of OLED.
用己二胺、 己二酸及双功能团的氯化螺环磷酸酯经界面缩合制得含磷尼龙66。
Phosphorus containing ny1on-66 was prepared by the interphase condensation between adipic acid, hexamethylenediamine and dichloropentate.
对称双头螺柱上的两个螺母松动力矩不对称是引起单边螺母松动的重要原因。
It is the main reason for loose of the nuts that loose torque affecting on two nuts of the double end studs is not symmetric...
由于螺双芴非平面的结构特征，可对2，2’，7，7’-位进行修饰，设计合成具有独特功能的发光材料。
According to the non-planar structure of spirofluorene, the previous research has focused on the modify of 2,2', 7,7'-location.
由于螺双芴非平面的结构特征，可对2，2’，7，7’-位进行修饰，设计合成具有独特功能的发光材料。
According to the non-planar structure of spirofluorene, the previous research has focused on the modify of 2,2', 7,7'-location.
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