left hand(ed) thread;left(ed) screw thread是什么意思

用法例句

Intorduced to develop hot rolled left screw bar ofΦ18、Φ20、Φ22that was needed by buyer.

介绍了在轧钢厂二车间开发顾客需要的Φ18、Φ20、Φ22的热轧左旋螺纹钢。

This thread combined laevogyrate thread and dextral thread together in the same part of the thread.

发明了一种新型螺纹—唐氏螺纹，这种螺纹采用的是变截面非完整螺纹，并且将左旋和右旋螺旋线复合 在同一段螺旋线上，具有左、右放螺纹的特点，可分别与左、右旋螺纹配合。

Optical Purity Analysis of Levodopa Drug by Capillary Electrophoresis;

毛细管电泳法测定左旋多巴药片的光学纯度

Preparation and the influencing factors of Levodopa Liposomes;

左旋多巴脂质体的制备及影响因素

Study on the Determination of Levodopa by Flow-Injection Electrogenerated Chemiluminescence;

流动注射电化学发光分析法测定左旋多巴的研究

A kind of biodegradable material poly (L-lactic acid)-polyethylene glycol (L-PLEG) was synthesized directly via melt polycondensation process with taking L-lactic acid (L-LA) and polyethylene glycol (PEG) having number average relative molecular mass (M_n) 1000 as raw materials.

直接以左旋乳酸(L-LA)单体和数均分子量为1000的聚乙二醇(PEG)为原料,通过直接熔融共聚法,合成了聚乳酸-聚乙二醇(L-PLEG)适宜的工艺条件为：以SnO为催化剂[m(SnO)/m(L-LA)为0。