简介：福建省沿海莱村，村西头住着一户吴姓人家。其子吴魁解放前毕业于国民党军校，后在国民党军队中服役。解放前夕，吴魁见势不妙，跑回老家。平时深居简出，成了一名“老实巴交”的村民。

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简介：AbstractThe pathophysiology of twin-to-twin transfusion syndrome (TTTS) is complex, and its understanding has evolved along with the evolution and revolution of fetal diagnostic and therapeutic techniques. Over the last few decades, several therapeutic interventions have been researched for improving the outcomes in TTTS. We present a summary of the current protocols for surveillance, diagnosis, and staging of TTTS in monochorionic pregnancies. We also describe in detail the technique for treatment of TTTS by endoscopic laser photocoagulation.

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简介：MPower显然是疯了,虽然是第一次将触角伸向SUV领域,却制造了两个在W高达动画片里才会出现的怪物,身躯庞大的X5M和X6M。

简介：摘要本文主要针对三门核电1号机组堆芯补水箱（CMT）硼浓度取样不合格分析原因，并结合不同原因提出诊断措施并给出解决建议。

简介：摘要：CMT(coldmetaltransfer）冷却式金属焊接过渡引弧技术焊接是奥地利福尼斯Fronius公司在传统无线电飞溅金属引弧焊接技术以及微金属连接点焊技术等的基础之上最新研发的一种新型利用熔化极性对气体具有保护性的焊接技术方法，针对超薄板、异种金属材料等进行焊接，有效率地消除了各种焊接中的缺陷，并且还能够同时得到良好的保护焊接性和接头。其"热－冷－热"模式持续高温交替（热量的输入量低）的主要特点在于可以有效率地降低工件焊接时所需要产生的全部热量。

简介：AbstractThe rate of twin pregnancies has increased over the last decades, largely because of the ongoing development of assisted reproductive technology and increased maternal age at childbearing. Twins have a higher risk of adverse outcomes during pregnancy and the perinatal period. The prevalence of umbilical cord abnormalities is higher for twin pregnancies compared with singleton pregnancies. Some of these abnormalities are nonspecific to twinning and can also be found in singleton gestations (such as velamentous cord insertion, vasa previa, and single umbilical artery). Other abnormalities are associated with monochorionic twins, such as umbilical cord entanglement, and umbilical proximate cord insertion. Most of these abnormalities can be detected by ultrasound evaluation. The early and accurate ultrasound diagnosis of chorionicity, amnionicity, and placental and umbilical cord characteristics is crucial if we are to predict the risk of complications and to determine the best management for twin pregnancies. Histopathological examination of the placenta and umbilical cord after delivery can help to confirm prenatal diagnosis and to provide a better understanding of the physiopathology of their abnormalities. The aim of this review was to emphasize the role that the umbilical cord plays in twin complications and to describe the management of these high-risk pregnancies.

简介：AbstractMode of delivery in twin gestation has been a matter of debate for decades. In 2013, the only randomized controlled trial concerning mode of delivery in twin gestations was published, answering some of the most pressing questions in this matter. The Twin Birth Study randomized patients carrying dichorionic-diamniotic or monochorionic-diamniotic twins, with the first twin in cephalic presentation, between 32 and 39 weeks of gestation, to planned vaginal vs. planned cesarean delivery, and found no significant differences in perinatal or maternal outcomes. These clinical findings greatly benefit our clinical practice, but there lacks related study investigating how the practices have changed. In this review, we searched PubMed from 1980 through January 2021 using combinations of the following terms: twin, delivery, vaginal delivery, and cesarean section. We will try to address the known literature before and after the publication of the Twin Birth Study in western countries and compare that to what has been practiced in China.

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简介：Thoughterroriststriggered(触发)thecollapse(倒塌)oftheWorldTradeCenter'sTwinTowers,muchoftheenergy--calculatedbyaphysicisttohavebeenatleast2percentthatoftheatomicbombdroppedonHiroshima(广岛)--wassuppliedbynature'smostubiquitous(普通存在的)force:gravity.

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简介：Thewavetransmissioncharacteristicsandwaveinducedpressuresontwinplatebreakwaterareinvestigatedexperimentallyinregularandrandomwaves.Atotaloftwentypressuretransducersarefixedonfoursurfacesoftwinplatetomeasurethewaveinduceddynamicpressures.Thespatialdistributionofdynamicwavepressureisgivenalongthesurfaceofthetwinplate.Theupliftwaveforceobtainedbyintegratingthehydrodynamicpressurealongthestructureispresented.DiscussedaretheinfluenceofdifferentincidentwaveparametersincludingtherelativeplatewidthB/L,relativewaveheight/iHaandrelativesubmergencedepths/aonthenon-dimensionaldynamicwavepressuresandtotalwaveforces.Fromtheinvestigation,itisfoundthattheoptimumtransmissioncoefficient,tKoccursaroundB/L0.41~0.43,andthetwinplatebreakwaterismoreeffectiveindifferentwaterdepths.Themaximumofpressureratiodecreasesfrom1.8to1.1whentherelativesubmergencedepthoftopplateisincreasedfrom0.8to+0.8.

简介：Withthickplatesof2219high-strengthalloy,themicrostructuresofweldedjointswithtwinwireMIGweldingwereanalyzed.Experimentalresultsshowthatnohotcrackwasfoundintheweldduetodiscontinuousdistributionofcocrystallizationwithlowmeltingtemperature,butporosityisseriousinthefirstweldseamthatismainlycomposedofequiaxialgrainswithunevensizes.Asthepoorpositionofthewholeweldedjoint,fusionzonehasbigandcoarsegrains,unevenmicrostructures;Inquenchingzone,thereexistalotofsoakedmicrostructuresthatcocrystallizationwithlowmeltingtemperaturesoluteintomatrix,thusstrengtheningthemetalinthiszone;Inexcessiveagingzone,muchmorephasesthatdistributeevenlywillbeseparatedfromthematrix;Outsidethiszone,propertiesandmicrostructuresofthemetalarebasicallysimilartomatrixduetotherelativelylowtemperatureorunaffectedheatinthezoneduringwelding.

简介：ColdMetalTransfer(CMT)weldingtechniqueisanewweldingtechniqueintroducedbyFroniuscompany.CMTweldingofnickel-basedalloywithstainlesssteelwascarriedoutusingCuSi3fillerwireinthispaper.Effectsofweldingparameters,includingweldingcurrent,weldingspeed,etc,onweldsurfaceappearanceweretested.MicrostructureandmechanicalpropertiesofCMTweldwerestudied.Theresultsshowthatthethicknessofinterfacereactionlayerofthenickel-basedalloyis14.3μm,whichisonly4.33%ofbasematerial.Theweldismadeupoftwophases,α-copperandiron-basedsolidsolution.Ruptureoccursinitiallyattheweldedseamneartheedgeofstainlesssteelinsheartest.ThemaximumshearstrengthoftheCuSi3weldedjointis184.9MPa.

简介：索尼针对年轻的消费群体，推出了CMT-DH30迷你音响。它采用黑色简约设计，通过索尼独有的S-Master全数码放大技术，传递出极具质感和弹性的音效。

简介：农场环境导游：（1）这里采用全封闭智能环控技术。（2）系统所需能量来自风能和太阳能。（3）栽培光源全部采用节能LED组合灯管。（4）蔬菜种植在多层MFT水耕栽培床上。（5）二氧化碳由人居生活环境自然供给。（6）蔬菜宝贝们能够自给自足并释放氧气。我是这里的小菜农PLC,负责植物们的：生长情况,控制温度、湿度、风速、光照等环境参数,监测并按需供给营养,保障蔬菜们长得又快又好,解放主人的大脑和双手。

简介：当形成飞时，太空船被用作站台获得土面向的观察，在这些太空船之间的精确基线总是是必要的。严肃恢复和气候实验(优雅)使命针对印射全球严肃地和它的变化。优雅卫星的精确基线为当模特儿的严肃地是必要的。成双的卫星的运动学、减少的动态相对轨道的决心为动态相对轨道在2公里的这份报纸，和精确性被学习了，为运动学的5公里能被获得，大多数在GPS歧义上的双差别由此被解决。

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