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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.

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。2。

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。

There are some gut relaxant drugs available, which can help to ease bloating and the symptoms associated with flatulence.

也有一些肠道松弛药物可用，它可以帮助减轻腹胀及相关症状与胀气。

This in turn can help to ease indigestion, stomach cramps, flatulence, colic, nausea and travel sickness.

这反过来又可以帮助缓解消化不良，胃痉挛，胀气，绞痛，恶心和旅行疾病。

I was a bit surprised because a floater like me could not possibly offer much help to her.

我有些意外，像我这样连个固定住所都没有的异乡人能帮她什么忙呢？

It can also help to predict how the foetus moves in the mother ′s womb during an accident.

它还可以帮助预测在事故发生期间胎儿如何在母亲的子宫内移动。

She 3 years old many when, grandmother died, she and grandfather depend on each other, rely on a pair of barefoot and Zun Lin right the clothings footgear that abandons give financial help to, will resist chill, spend age winter summer.

她3岁多的时候，外婆就去世了，她和外公相依为命，靠一双赤脚和左邻右舍接济的衣物鞋袜，来抵御风寒，度过春秋冬夏。

As a kind of forcible restriction, law is not omnipotence, but it can help to make up the market's limitation and create a more appropriate environment for the market.

作为一种带有强制力的约束，法律虽然不是万能的，但可以对信息差距进行规制、引导，弥补市场的缺陷，为市场运行创造良好的环境。

Good eating habits help to fortify the body against disease.

良好的饮食习惯有助于加强身体的御病能力。

This will help to ensure that any losses are fully reimbursed and future fraudulent transactions do not take place.

这将有助于确保所有损失得到充分的补偿，确保未来的欺诈交易不再发生。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。