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On the basis of the conclusion above, the nonlinear weak controllable vectors can be obtained, which compose the second class of weak controllable matrix, by means of matrix transfermations of the first class of weak controllable matrix. Furthmore the second criterion of weak controllability, accessibility and strong accessibility, which is more standard, more succinct and more practical, is obtained. On the basis of the first criterion and the second criterion, several important problems about nonlinear controllability are discussed, which include 1 local controllability; 2 three classes of local controllable decomposition, separately by means of local coordinate changes in the neighborhood of a nonsingular point, a point on a singular surface or a designated point x〓 with a designated input u〓; 3 the character of controllability of the ith state variable x〓 in different controllable areas and their boundaries.

在第一判别定理和第二判别定理的基础上，我们分析了非线性系统受控性质中的几个重要问题，所得到的结论包括i得到了非线性系统在可平衡点附近的能控性判别定理；ii分别给出了非线性系统在非奇异点、s阶奇面以及在状态空间内给定的一点x〓和输入u〓上的三种状态分解形式以及相应的求解方法；利用系统的Ⅰ型弱能控矩阵与Ⅱ型弱能控矩阵秩相等的条件，得到了只用系统的前n个弱能控向量来判断系统的弱能控性的判别定理；iii通过引入系统状态分量的三类受控区域边界的定义及相应的求解方法，初步探讨了非线性系统各个状态分量在不同的受控区域及其边界上的受控性质。

Roger since the invention of the transistor oscillation push-pull single transformer DC converters, is to achieve high-frequency conversion control circuit beginning in 1957 the U.S. investigation self-invented the push-pull Two-transformer, 1964 U.S. scientists have proposed abolition of the frequency of the series switching power supply transformer, as envisaged in this power to the volume and weight of the decline was a fundamental way.

Roger发明的自激振荡推挽晶体管单变压器直流变换器，是实现高频转换控制电路的开端，1957年美国查赛（Jen Sen发明了自激式推挽双变压器，1964年美国科学家们提出取消工频变压器的串联开关电源的设想，这对电源向体积和重量的下降获得了一条根本的途径。

In 1875, German immigrant to the U.S. Louis Prang, opened a lithographic shop with $250, and published the first line of U.S. Christmas cards.

直到1875年，德国移民美国的路易斯普朗用250美元开了家印刷店，美国才开始发行第一批圣诞贺卡。

Chevrolet Cruze goes on sale in the U.S. in the third quarter of 2010 but has already logged more than 4 million miles in quality and durability testing worldwide, making it one of the most real world-tested GM products prior to a U.S.

雪佛兰Cruze接着在美国出售的2010年第三季度，但已经记录在质量和耐久性测试世界各地400多万公里，使它成为最真实世界测试之前，通用汽车的产品在美国推出。

Earnings of the U.S. branch of a foreign corporation would also be subject to U.S. taxation at the applicable corporate rate, internal distributions of the after tax profits would not constitute dividends subject to the second layer of tax.

虽然外国公司的美国分支机构也根据相应的公司税率缴纳美国税收，但税后所得的内部分配不构成需缴纳第二层次税收的股息。

No. 3: The U.S. spy plane landed at a Chinese military airport. The U.S.

第三，美国间谍飞机降落在中国的军用机场。

"Newsweek" that although there are a number of journalists in war coverage throughout the process of the U.S. military march to Baghdad, but the light on the screen to see U.S.

同样，在CNN的电视画面上也不可能出现太空中24小时不停顿经过伊拉克上空的侦察卫星、高空预警机和低空无人侦察机。

A new technology developed by israeli dermatologists for psoriasis, vitiligo, atopic dermatitis, and leukoderma has been cleared by the u.s. food and drug administration to be marketed in the u.s.

由以色列皮肤科医生最新研究用以治疗银屑病、白癫风、过敏性皮炎以及白变病等的先进科技已经通过fda的批准以在美国上市。

U.S. Global ocean ecosystems dynamics is a component of the U.S. Global Change Research Program organized by oceanographers and fisheries scientists to address the question of how global climate change may affect the abundance and production of animals in the sea.

&美国全球海洋生态系统动力学研究计划&由海洋学者、渔业专家组成，是&美国全球变化研究计划&的一部分，主要研究全球气候变化对海洋生物的丰度和生产量的影响。

What were the relative contributions to a credit bubble in the U.S. of changes in global savings; changes in relative savings between the U.S. and other countries; and low interest-rate policies of the Greenspan Fed? Was risk systematically underpriced in the US and other countries?

哪些相关的因素导致了美国的信用泡沫，是全球储蓄的改变，还是美国和其他国家相对储蓄的改变，还是格林斯潘美联储的低利政策，和美国及其他国家的系统性过低定价的风险？

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。