| 1. | We present the national primary and second ambient air quality standards as upper bound guideline .
我们把国家一级和二级环境大气质量标准作为上限控制线。 |
| 2. | Burke says students often think of language learning as dull , but it doesn ' t have to be
从一级和二级开始，我每次都会回忆前面的词语，然后增加20个新词。 |
| 3. | Compressor has psv ' s on the first and second stage discharges that will go to separator should one lift
压缩机一级和二级出口设有psv ，当起跳时排至分离器。 |
| 4. | Article 3 the wild animals and plants which enjoy the first - class national protection are forbidden to be used as the raw materials of health food
第三条禁止使用国家一级和二级保护野生动植物及其产品作为保健食品原料。 |
| 5. | After concisely introducing the development and current situation of inverte pendulum system research , the analytic models of single inverted pendulum and two - stage inverted pendulum are derived and the activity feature of them are simulated using matlab
本论文首先阐述了倒立摆系统控制的研究发展过程和现状；随后详细介绍了一级和二级倒立摆系统的动力学建模过程，并用matlab对倒立摆的运动特性进行了仿真。 |
| 6. | Based on test method of national standard of anti - deflagration , influences of moisture and charge density on anti - deflagration of permissible expanded ammonium nitrate explosive have been tested and investigated , residual mass of acceptor explosive have also been measured at same time
摘要根据抗爆燃性有关标准的测试方法，详细地测试和研究了水分和装药密度对受试的一级和二级煤矿许用膨化硝铵炸药的抗爆燃性的影响，同时测定了被发装药的残药量。 |
| 7. | An electro - discharge machining control comprising first and second current sources of relatively high and low voltage respectively , first switch means for repeatedly connecting said second source to an output for a first duration for connection to an electrode and second switch means for repeatedly connecting said first source to said output only when said second source is connected to said output and for a constant duration which is shorter than the first duration of the connection of said second source to the output
放电加工控制包括较高和较低电压的一级和二级电流源，第一个开关意味着用于重复连接第二电源到输出线，用于第一个持续时间连接一个电极和第二个开关意味着重复连接第一个源到输出线，只有当第二电源连接到输出线时，固定时间间隔小于连接第二电源到输出线的第一个持续时间。 |
| 8. | According to its characteristics of technological enterprise , we carry out choice of credit estimation methods and try to build modes of estimation of small and middle enterprise with science and technology through analysis of credit and comparison of graded methods , mounting filtration of the index systems and index of estimation and index layer for one grade and two grade and picking up them under the balance of setup methods so that the system of the index can form framework
根据科技型中小企业的特点，通过针对科技型中小企业的信用分析和评分方法比较进行信用评价方法的选择，试建立了科技型中小企业信用评价模式。设置了该指标体系的筛选性指标和评价性指标以及一级和二级指标层，并进行了权重设置方法的选择，使该指标体系初步形成框架，进而可以为担保信用评级提供参考方法和思路。 |
