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The various methods for the preparation of lead dioxide that have been propose d from time to time may be subdivided into chemical and electrolytic preparations.

各种层出不穷的二氧化铅的制备方法可分成化学制备和电解制备法两类。

Whereas lineation is a penetrative linear structure developed in rocks, and can be subdivided into small lineation and large lineation.

线理是岩石中发育的具透入性的线状构造，可分小型线理和大型线理。

When the mechanism of the mylonite is chiefly recrystallization, the rock can be subdivided into phyllonite, structuralschist and structural gneiss on the basis of crystallization and crystal grain size.

机制以重结晶作用为主的糜棱岩可根据结晶程度和结晶颗粒的大小可分为千糜岩、构造片岩和构造片麻岩。

It can be subdivided into coarse mylonite, mylonite and ultra-mylonite for its increasing mylonitization. On the other hand, the recrystallization

随着糜棱岩化程度的增高可将糜棱岩进一步划分为粗糜棱岩、糜棱岩、超糜棱岩。

The mantle metasomatism in western Shandong could be subdivided into two stages, i.e. early metasomatic event with interstitial phlogopite and late metasomatic event with orthopyroxene vein or orthopyroxene+phlogopite vein.

鲁西区地幔交代作用应有两期，即早期的填隙型金云母和晚期的斜方辉石脉或斜方辉石+金云母脉体的形成，早期交代介质为富含CO〓和H〓O的熔体，晚期交代介质为富硅质的熔体。

Sedimentary facies model for mixed sediments of recent reefoid carbonates and siliciclastics is developed from the facies model of fringing and barrier reefs. Based on the sedimentary facies and textures, mixed sediments may be subdivided into 5 types as follows: 1 reef base mixed sedimentary rocks and reef framework mixed sedimentary rocks; 2 reef flat sand-gravel mixed sedimentary rocks; 3 backreef beach-dune gravel-sand mixed sediments; 4 backreef lagoonal sand mixed sediments ; and 5 reef front littoral sand mixed sediments.

礁源与陆源混合沉积相模式是从岸礁一堡礁相模式基础上发展而来，根据其沉积相和沉积结构特徵可以分为5种混合沉积：①礁基混积岩和礁格架混积岩；②礁坪砂砾屑混积岩；③礁后海滩－沙提砾砂屑混合沉积；④礁后泻湖砂屑混合沉积；⑤礁前浅海砂屑混合沉积。

Of them, we proposed the term of the Toyon volcanogroup in the first time. All the volcanoes can be subdivided into two types: central-eruption-typeand flood-basalt-type, building a series of volcanic mechanism, including calderas, volcanicnecks and cone sheets.

托云火山岩是由多个近于同时喷发的火山口的喷出物复杂堆积的产物，这些火山口可以划分成中心式火山和溢流玄武岩两种类型，它们共同组成了托云火山群。

Seismites can be subdivided into many types,such as seismic corrugated rock,shattered rock,seismic collapse rock,autoclastic breccias,intraclastic parabreccia,liquefied breccia and seismoturbidite rock.

研究区震积岩的岩石类型则主要包括震褶岩、震裂岩、震塌岩、自碎屑角砾岩、自碎屑副角砾岩、液化角砾岩及震浊积岩等。

The front of south Qilian Mt. can be subdivided into two units:outcrop unit and basined unit,and strong tectonic activities,which controlled depositing process in Cenozoic and distribution of present Mesozoic systems,have occurred in Late Mesozoic in this area.

南祁连山前区可以分为露头和盆地区两个不同的大地构造单元，本区晚中生代构造活动强烈，控制了新生代的沉积过程和现今中生界残余层序的分布。

Petrological and petrochemical characteristics show that there exist such volcanic and subvolcanic rock types as basalt, iddingsite olivine basalt, olivine basaltic trachyandesite, trachybasalt, latite, trachydacite, trachyte, rhyolite, tuff and granite-porphyry in northeast Jiangxi Province. The volcanic rocks can be subdivided into high K calc-alkaline series, shoshonite series and alkaline basalt series.

岩石学及岩石化学特征表明，赣东北地区早白垩世火山岩及次火山岩主要有：玄武岩、伊丁石化橄榄玄武岩、橄榄玄武粗安岩、粗面玄武岩、安粗岩、粗面英安岩、粗面岩、流纹岩、凝灰岩及花岗斑岩等，可划分为高钾钙碱性、橄榄安粗岩和碱性玄武岩3个系列。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。