优缺点

Analyzed with single power factor correction flyback switching power supply of their working principle, advantages and disadvantages.

分析了带功率因数校正的单片反激式开关电源的其本工作原理，优缺点。

It points out the corresponding adjustments taken by the system.

本章最后对1934年体制进行了评价，指出其优缺点及矛盾所在。

Three methods for synthesis of coumarin were introduced in the article,and their advantages and disadvantages were compared.

对香豆素常用的三种合成方法进行了介绍，对其工业化生产的优缺点进行了对比，最终选定了水杨醛法，并给出了工艺流程图和操作步骤。

The method of coumarin synthesis using salicylaldehyde was selected,flow chart and operation process were studied in this paper.

对香豆素常用的三种合成方法进行了介绍，对其工业化生产的优缺点进行了对比，最终选定了水杨醛法，并给出了工艺流程图和操作步骤。

This article mainly aims at introducing the process,the structure and the characteristics of continuous countercurrent extraction .

介绍了连续逆流提取的工艺过程、主体结构及性能特点，并分析了其在实际应用中存在的一些优缺点。

A great deal of valuable results have been obtained on Cox proportional hazards model.

它们各有自己的优缺点和适用范围。

Results:The positive rates of DSA and CTA of 12 patients with anterior communicating aneurysm were 100%.

目的：评价DSA与CTA诊断前、后交通动脉瘤的优缺点。

With curvilinear regression analysis we can prove that the result of the new approach is high correlation with MTF measured by optical instrument, in other words, the new method is sensitive to the change of image definition. When compared with traditional method, the result of analysis can also show that the new method is better than traditional method, such as entropy, to assess gray scale digital image definition.

目前 ，对数字图像清晰度的评价方法主要有空域参数方差、熵以及频域调制传递函数MTF等，但由于这些方法各有优缺点，如空域参数虽评价简洁、快速，但对图像清晰度的细小变化不敏感；频域参数虽对图像清晰度变化敏感，但计算较慢，不宜程序运算的自动化。

The strong and weak points of the guillotine cutting stock problem based on strip patterns were analyzed.

在分析具有条状结构特点的二维斩断切割布局已有模型优缺点的基础上，提出了具有条块结构特点的斩断切割布局方案以及基于条块结构的斩断切割启发性规则，建立了相应的优化模型和算法。

Based on practice of cyanidation leaching with air agitation cyanidation trough in Wulaga Gold Mine,this paper briefly introduces the principle of trough work and its application in practice,and analyzes its performance characteristics,advantages and disadvantages.

结合乌拉嘎金矿的氰化浸出作业应用空气搅拌浸出槽的实践，简要介绍了空气搅拌浸出槽的工作原理和生产应用情况，并分析了其性能特点及优缺点。

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。