1)  needle-like
针叶形
1.
To recycle calcium carbide residue that was the waste by-product of industry,needle-like calcium carbonate was synthesized by calcium carbide residue.
为有效利用电石渣资源,以电石渣为原料合成了针叶形碳酸钙。
2)  needles
针叶
1.
Variations of concentrations of elements in needles of Pinus massoniana(L.) along an urban-suburban gradient in Guangzhou;
广州城郊环境梯度下马尾松针叶元素质量分数变化特征
2.
Studies on diterpenes in needles of Pinus sylvestris;
樟子松针叶中二萜类成分研究
3.
Change of ABA content inside the damaged Pinus massoniana needles.;
受害马尾松针叶内脱落酸含量的变化
3)  needle
针叶
1.
Nutrient contents and resorption characteristics in needles of different age Pinus massoniana (Lamb.) before and after withering;
不同林龄马尾松针叶凋落前后养分含量及回收特征
2.
With the appearance observation and the determination of the contents of Cr,Zn,Pb,Mn,Fe,Cu and S in different ages of needles of Pinus.
ExEndl)不同年龄针叶中Cr,Zn,Pb,Mn,Fe,Cu等重金属元素及元素S质量分数的分析,探讨了它们与北京大气污染之间的关系。
4)  leaves
针叶
1.
Objective: To study the non-taxoids in the leaves of Taxus mairei.
目的:研究美丽红豆杉针叶中的化学成分。
5)  softwood
针叶木
1.
The influence of PFI beating on fibre and handsheet properties of hardwood and softwood kraft pulps was investigated.
研究了针叶木和阔叶木硫酸盐浆PFI打浆对各自纤维性质及浆张性能的影响。
6)  conifers
针叶树
1.
Physico-chemical characteristics of ambient particles settling upon leaf surface of six conifers in Beijing;
北京市六种针叶树叶面附着颗粒物的理化特征
2.
The Development and the Prospect on the Conifers Grafting;
针叶树嫁接研究进展与展望
3.
Field Performance of Introduced Conifers in Zhanggutai Sandy Area, Liaoning Province;
章古台沙地针叶树引种造林试验
参考词条
补充资料：J形及L形密封
分子式：
CAS号：

性质：两种均为唇形橡胶密封，截面形状分别为J形和L形。多为纯橡胶制品，也有少数是夹布制品。根据使用条件，一般用天然橡胶或丁腈橡胶制造。结构较简单，摩擦力低，专用于气压或液压机械设备的活塞及活塞杆密封，工作压力在1MPa以下，如用于汽车和火车制动系统及离合器操纵系统中，起传递压力和密封的作用。

说明：补充资料仅用于学习参考，请勿用于其它任何用途。