The metamorphism of coal is primarily contact metamorphism,and there are complex coal types.
吴桂桥井田喜山期岩浆活动剧烈，多以岩床形式顺层侵入煤层顶底板及煤层中间，对煤层赋存形态、结构、煤质产生较大破坏影响，变质作用以接触变质为主，煤类复杂。
Characteristics of zircons from a metamorphic contact zone of the Songshugou ultramafic pluton in North Qinling and their geological significance
北秦岭松树沟超镁铁质岩体接触变质带中锆石特征及其地质意义
The Research for Minaral Transition of Contact Metamorphism of Late Paleozoic in the Central of Inner Mongolia, China
内蒙中部地区晚古生代地层接触变质作用矿物转化研究
Mesozoic Guposhan-Huashan Granitic Batholith in Western Nanling and Strain Characteristics of Its Thermal Contact Metaporphic Country Rocks
南岭中生代姑婆山-花山花岗岩基及其热接触变质围岩的应变特征和应变分析
Ethnic contact between Han and Chuang and The Dual Nature of Ping Dialect
汉、壮民族接触与平话变异的双重性质
Study on the effects of lipid peroxidation in the workers occupationally exposred to manganese;
职业性锰接触工人脂质过氧化改变观察
the attribute of being easy to meet or deal with.
易于接触合作的性质。
For bullet-nose connections, the variables include materials of construction, contact surface conditions, thread condition, and machining quality.
对于弹头接头，变量包括建材、触表面的状态、纹的状态和加工质量。
The Analysis of Chromosome Aberration by Chemical Poisons
接触化学物质有胚胎损失的十八对夫妇染色体畸变分析
Changes of serum MDA level, SOD and GSH-Px activities in the workers exposed to N,N-dimethylformamide;
二甲基甲酰胺接触工人血清3项脂质过氧化指标的变化
A movable electrical contact, as in a rheostat.
接触电刷变阻器等内部的活动电接触器
exposure to or contact with harmful substance
暴露于有害物质中或接触有害物质
travelling contact
动接触， 活动触点
(of wood) darkened or colored by exposure to ammonia fumes.
（指木头）接触到氨气而变黑或有色。
This food will deteriorate rapidly on contact with air.
这种食物一接触到空气即迅速变坏。
Catalytic Converter to Muffler and Exhaust Pipe Connection
触媒变换器至消音器及排气管的连接
We have to take the engine down to get to the gearbox.
我们必须拆下引擎，才能接触到变速箱。
Studies on Deformation of Non-Contacting Gas-Lubricated Face Seal;
非接触式气体润滑机械密封变形研究
Modeling and Simulation for Tooth Face Contact Analysis of Transmission Gears;
变速器齿轮齿面接触分析建模与仿真