难得到的

Harbin 150001, China）Abstract: Based on the mould features, the fluid mechanics models were founded. Integrating with the finite element method, the hydro-mechanical deep drawing of alumite LF6 was simulated. The alumite LF6 was formed by hydro-mechanical deep drawing, and the reasonable process parameters were obtained.

摘 要：根据模具几何特征，通过建立流体力学模型描述液体对板料单元的动态影响，结合有限元数值模拟技术对塑性差、难成形材料防锈铝LF6的充液拉深进行数值模拟，并进行实验研究，得到了防锈铝充液拉深合理工艺参数。

Based on the mould features, the fluid mechanics mode ls were founded. Integrating with the finite element method, the hydro-mechanical deep drawing of alumite LF6 was simulated. The alumite LF6 was formed by hydro -mechanical deep drawing, and the reasonable process parameters were obtained.

根据模具几何特征，通过建立流体力学模型描述液体对板料单元的动态影响，结合有限元数值模拟技术对塑性差、难成形材料防锈铝LF6的充液拉深进行数值模拟，并进行实验研究，得到了防锈铝充液拉深合理工艺参数。

The term is now so widely and divergently applied that it's hard to pin down what it actually means.

如今，六西格玛这一概念已经得到了广泛的应用，很难给其下明确的定义。

But the reflection factor is in a standard filter important coefficient, but uses the alternative means to be very difficult to guarantee front and the retroreflection coefficient value is smaller than 1, and is unable to obtain its correlation function precisely, especially has this kind of serious problem in linear prediction coding equisignal processing, the BURG algorithm can in then be able to determine from the very beginning its exponent number and the transmittance have then overcome a limit question.

而反射系数是格型滤波器中的一个重要系数，而采用其他方法很难保证前向与后向反射系数的值小于1，并且无法精确得到其相关函数，尤其在线性猜测编码等信号处理中存在着这种严重问题，BURG算法能在一开始便能确定其阶数和传递系数便克服了着一限制问题。

The cabbies expect to have a hard time understanding them so they are prepared when the street names are mangled, but they see me and expect perfect mandarin then look at me like an idiot when I get it slightly off.

运的期望很难理解他们，使他们准备时，街道名称是避而不谈，但他们看到我，并期望完美的普通话然后看我像一个白痴当我得到稍微偏离。

They have few avenues for redressing abuses, and little access to resources that could help them build better lives.

当他们人权受到侵害是往往求助无门，有限的资源也很难使他们的生活得到改善。

You would actually be better to get your own rest during these occurrences, difficult as it sounds.

您实际上将更好地得到自己的休息这些事件，很难，因为它的声音。

MASTER: Flatterers think that the rich man will loosen his purse-strings for them. But it is very difficult to get anything from him.

师父：奉献者会认为富人会为他们解开钱袋上的绳子，但很难在他的身上得到任何好处。

Getting actual rescue footage with Hummers could be difficult, Ms.

Stooke 女士说，得到真正的用悍马营救的画面会很难。

The quality of private-label goods has improved, making it harder for consumers to discern any difference between a store's brand and a more expensive rival, particularly for commodities such as paper towels or milk.

因为自有品牌产品质量已经得到改良，特别是常用的手纸、牛奶等日用品，使得消费者很难分辨它们和驰名品牌产品之间的差别。

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。