空铅

Ore deposits of this region are assigned to Caledonian metallogenic series and Indosinian metallogenic series according to ore-bearing strata, granites related to ore deposits mineralization type and temporal-spatial distribution characteristics of ore deposits. The Caledonian series is further divided into three subseries, namely lead and zinc metallogenic subseries, lead, zinc and iron metallogenic subseries and lead, zinc, tungsten, tin and molybdenum metallogenic subseries.

本文根据所发现的25个矿床的赋矿地层、与成矿有关的花岗岩、矿化类型及其时、空分布特征，将它们划分为加里东期成矿系列和印支期成矿系列，进而又将加里东期成矿系列划分为铅、锌成矿亚系列，铁、铅、锌成矿亚系列和铅、锌、钨、锡、钼成矿亚系列。

β-Cyclodextrin with the 6-hydroxyls protected by dimethyl-tert- butylsilyl was selectively oxidized by lead tetraacetate. After the silyl groups were removed off by boron fluoride-etherate, mono-2,3- dialdehydro-β-cyclodextrin as a cuniform molecule could be constructed.

用四醋酸铅将七元（6-O-二甲基叔丁基硅基）-β-环糊精选择氧化、并用三氟化硼乙醚脱硅基保护基后，再经分离、纯化，可获得具有&楔筒状&空腔的单-2， 3-二醛基-β-环糊精。

MC44144 Pinout: Flyback and Synchronous Rectifier Apps Provides Complementary Auxiliary Driver with Programmable Deadtime (Turn-On Delay) between AUX and MAIN Switches Peak Current-Mode Control with 0.5-V Cycle-by-Cycle Current Limiting Hiccup Mode 0.75-V Current Limit TrueDrivet 2-A Sink, 2-A Source Outputs 110-V Input Startup Device Trimmed Internal Bandgap Reference for Accurate Line UV and Line OV Threshold Programmable Slope Compensation High-Performance 1.0-MHz Synchronizable Oscillator with Internal Timing Capacitor Precise Programmable Maximum Duty Cycle PB-Free Lead Finish Package

MC44144引脚说明：反激式同步整流和应用服务提供补充辅助与可编程死区时间之间的辅助和主开关峰值电流模式控制0.5 - V的逐周期电流限制打嗝模式0.75 - V的电流限制TrueDrivet 2 - A号水槽，2 -阿源精确的线路过压阈值线UV和可编程斜率补偿高性能1.0 - MHz的振荡器可同步输出110 V输入启动装置边内部带隙基准，内置精密程控定时电容最大占空比无铅引脚完成包

DEFINITION-NAME in upper-case, mono-spaced, bold-face letters

定义名，是大写格式、单空铅、粗体字元

During the soldering of lead-free solders, blowholes and pad lifting problems will often occur, by applying cooling systems at 10℃, can solve the above problems.

无铅焊锡在焊接时容易产生空泡及焊盘剥离等问题，在出口处使用可达10℃的冷气系统，可明显改变上述问题。

By the result of study, if the furnace temperature can be controlled under about 950℃, the distribution of lead in fly ash and reaction ash might reduce 1.16% and 6.64%, and the TCLP leachate could keep under the regulation control standards.

由研究结果，若能於实厂操作时，透过一次及二次空气量之调节，将炉温控制於约950℃以下，降低飞灰与反应生成灰中铅分布比例1.16％、6.64％，其TCLP溶出量将可有效控制在法规之管制标准以下。

On the basis of the thin-wall beam finite element model of an aqueduct with fluid-structure coupling,the seismic response of some large aqueduct is studied by use of the bilinear model and the Wen model to simulate nonlinear hysteretic curve of the lead rubber bearing.

采用流固耦合渡槽薄壁结构梁段单元有限元模型，分别利用双线性模型和Wen模型来模拟铅芯橡胶支座的非线性滞回恢复力特性，对某大型渡槽结构进行了空间隔震响应研究。

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。