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The modal tests of PCB and PCB assembly (free boundary condition and fixed boundary condition) were carried out. The equivalent elastic modulus and damping parameters of PCB can be gained, and the fixed boundary condition of finite element model was also determined. These will help to the following work. Second, drop impact tests of three different heights were carried out. Strains and acceleration responses of PCB were measured. Failed BGA packages of different test conditions were dyeing, and cross section analysis of failed solder joints was conducted. It was found in our drop tests that the root cause of lead-free solder joints under drop impact was the combined effect of mechanical shock and PCB bending vibration.

针对JEDEC标准试件的局限性，提出了设计便于统计学研究焊点可靠性的试验试件的构想，利用有限元模态分析方法确定并验证了用圆形PCB组件替代JEDEC标准试件的可行性；通过一系列模态试验和有限元模态分析，确定了圆形PCB组件的相关试验参数，这不仅为跌落碰撞下PCB组件有限元模拟确定了较为合理准确的有限元模型，而且为正确地评价跌落碰撞下PCB组件的可靠性问题奠定了基础。

As the saying goes, the mother is the greatest, in order to meet a child's wish; she put herself out of the way, and went to the foot of the Great Wall with children. Perhaps parents all share a common long-cherished ambition, perhaps people are able to understand the dreams hided in the hearts and minds of young children, With the help of the masses of tourists, the children finally step onto the wall and have a overlook, in her panic eyes, it reveal out a ripple flash of smile.

俗话说母亲是最伟大的，为满足孩子的愿望，她不辞辛苦，领着孩子来到了这长城脚下，或许是为人父母都有着共同的夙愿，或许是人们都能理解孩童幼小心灵中的梦幻，在众游客的帮助下，小朋友终于登城远眺，在她那惊却的眸子中闪露出了丝丝的微笑。

Therefore the small house sparrow was very not convinced may not be able to discover any good method to for a while press under its tree to have a butcher to slice meat exactly the small house sparrow to the big house sparrow saying that you were not fierce that you have the original story to fly make the block meat from the butcher hand to come up the big house sparrow to smile say small KS, therefore a dive flew on the table to hold in the mouth a meat to fly the tree to be possible to grasp by the butcher butcher unusual vitality then to pull out all of a sudden the big house sparrow the wool, the big house sparrow only shouted HELP, the small house sparrow could not tolerate really flew all of a sudden to butcher's handAs soon as nipped a butcher hand to hurt then puts the big house sparrow the big house sparrow to go all out to fly the tree to come the small house sparrow saying that then does not boast I to rescue your you inadequately to be possible the big house sparrow to say exactly early who wanted you to rescue my me to prepare to remove completely clothes to do with him.

小麻雀很是不服气可一时又找不出什么好的法子要难为它恰好树下有一个屠夫正在切肉于是小麻雀就对大麻雀说你不是厉害吗那你有本事飞下去从屠夫手中弄块肉上来吗大麻雀笑笑说小KS，于是一个俯冲飞到桌上叼了一块肉就要飞上树可一下子被屠夫抓了个正着屠夫非常生气便一根一根地拔大麻雀的毛，大麻雀只呼HELP，小麻雀实在看不过去了一下子飞下去冲着屠夫的手就咬了一口屠夫手一疼便把大麻雀放了大麻雀拼命飞上树来小麻雀说这下不吹牛了吧要不是我救你你早活不成了可大麻雀说谁要你救我呀我正准备脱光了衣服跟他干呢。

Your mission is to help guide Santa out of this hellish place in one piece and find out what's going on.

你的任务是帮助指导圣诞老人一块来在一本地狱般的地方，并找出发生了什么事情。

He called out to a passing traveler for help, but instead of holding out a helping hand, the man stood by unconcernedly, and scolded the boy for his imprudence.

他向路过的一个人求救，但路人并没有对他伸出援助之手，而是漠不关心的站在那里，并责备他的不小心。

Issan survivors from the head of the headquarters where understanding is astounded to learn from this trap. IMF aims to find out the true structure of treason, in order to prove his innocence and find out the real traitors. Chairperson of the KhoiSan Jim quietly returned to the apartment, in Clair's "help". He quickly notes from the computer code named Max and a female buyers intelligence meetings, computer, The Max has Noc are willing to buy the real list, use this line, Chairperson of the KhoiSan Max associated with the initiative. She was willing to put money at the cost of forsaking the true KPE win list.

幸存的伊桑从总部组长那里谅讶地获悉此次行动实属圈套，目的是要查出IMF组织里的真正叛国者，为证明自己的清白无辜，查出真正的叛徒，伊桑悄然返回吉姆的公寓，在克莱尔的"帮助"下，他从电脑中很快就注意到了一份与代号叫马克斯的女买家交易情报的会议记录，电脑显示，这位马克斯曾愿出高价购买真正的Noc名单，利用这条线索，伊桑主动与马克斯联系，假意提出愿以金钱为代价替她夺取真正的NOC名单。

I can't work out this math problem. Please help me out.

我做不出这道数学题，请帮我解决。

They also point out that new technologies such as print on demand, which makes printing short runs of physical books more economical, should help them squeeze more money out of the old-fashioned format.

他们同样指出，像按需印刷这样的新技术使得实体图书的短版快印更加经济，这应该会帮助他们在传统业务中节约出更多的资金。

I grasp at the upper right knob firmly. When the car dropped in the river locked outside, I held the breath and broke the front window and got out, and then swam toward the bank. I laid on the rock beach and felt serious headache, my eyes and ribs all got wounded. I cried for help in the pitchy night but nobody could hear. The folks found the bloody me at all with the light from the only water proof solar energy flashlight around me. I was informed after I was uplift to the beach that Lao Zheng and Lao Liu were thrown out of the car with their head broken. The wound in Lao Liu's face was blooding endlessly with his clavicle broken. Yi Su was found to be lost when three of us were gathered together.

我紧紧拉住右上角的把手不放，当车反扣着落入江中时，憋足一口气从破碎的前窗爬出去往岸边游，我躺在石滩上觉得自己的头快裂开了，眼睛、胸肋骨都受伤了，漆黑的夜里大声呼救，路上空无一人，好在身上还有一个防水的太阳能电筒，附近的老百姓终于找到了血人般我，被抬上去之后才知道翻滚中老曾和老刘被抛出车外，两个人都头破血流，老刘脸上的大口子不停的流血，他的锁骨也断了。

I grasp at the upper right knob firmly. When the car dropped in the river locked outside, I held the breath and broke the front window and got out, and then swam toward the bank. I laid on the rock beach and felt serious headache, my eyes and ribs all got wounded. I cried for help in the pitchy night but nobody could hear. The folks found the bloody me at all with the light from the only water proof solar energy flashlight around me. I was informed after I was uplift to the beach that Lao Zheng and Lao Liu were thrown out of the car with their head broken. The wound in Lao Liu's face was blooding endlessly with his clavicle broken.

我紧紧拉住右上角的把手不放，当车反扣着落入江中时，憋足一口气从破碎的前窗爬出去往岸边游，我躺在石滩上觉得自己的头快裂开了，眼睛、胸肋骨都受伤了，漆黑的夜里大声呼救，路上空无一人，好在身上还有一个防水的太阳能电筒，附近的老百姓终于找到了血人般我，被抬上去之后才知道翻滚中老曾和老刘被抛出车外，两个人都头破血流，老刘脸上的大口子不停的流血，他的锁骨也断了。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48