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This paper analyses the frequency characteristics of the gear meshing and the signals due to amplitude and frequency modulation.

本文分析了齿轮传动的频率特性和它所产生的频率和幅值调制信号。

Q: It can be inferred from the passage that the drop in Amtrak ridership was due to the fact that .

从文章中可以推断：美国铁路客运公司客流量下降的原因是。

There is opposition due to an image of KMT both as a mainlanders' and a Chinese nationalist party out of touch with local values.

有人反对，由于国民党的形象，作为内地'和中国民族主义党脱离当地价值。

But if the cell density of Anabaena flos-aquae increased to 5×10^9 cellsl^(-1), the staining rate would fall to 67% obviously due to cell twisting together.

对细胞密度为4×10^7-5×10^8个l^(-1)的水华鱼腥藻，FDA染色效率可达91%以上，但细胞密度增大到5×10^9个l^(-1)时，由於藻丝体易卷曲在一起，FDA染色率下降到67%。

But if the cell density of Anabaena flos-aquae increased to 5×10~9L~-1, the staining rate would fall to 67% obviously due to cell twisting together.

对细胞密度4×10~7～5×10~8 L~(-1)的水华鱼腥藻，FDA染色效率可达91%以上，但细胞密度增大到5×10~9L~(-1)时，由于细胞易卷曲在一起，FDA染色率下降到67%。

Chronic heart failure and chronic obstructive pulmonary disease are frequently associated with the progressive development of malnutrition, due to reduced energy intake, increased energy expenditure and impaired anabolism.

慢性心力衰竭和慢性阻塞性肺疾病患者经常出现进展性营养不良，主要是由于能量摄入减少，能量消耗增加以及合成代谢受损所致。

It is necessary for socialism ideology innovation to achieve the due realistic goal to have not only the implementing mechanism but also managing some relations correctly such as the relation between theory and reality, between inheriting and development, between mainstream and anabranch.

社会主义意识形态创新要达到其预期的现实目标，除了要有一定的实现机制，从理论本身来讲，还必须正确处理一些关系，比较重要的有理论与实际的关系、继承与发展的关系、主流与支流的关系。

This can be due to a number of conditions such as anaemia or a problem with the metabolism.

这可由于一些条件，如贫血或有问题的代谢。

Anaemia, due to iron deficiency, is common in pregnancy whether you are vegetarian or not.

贫血，由於缺铁，是常见的妊娠无论你是素食主义者或没有。

According to the blood test, you are suffering from an iron deficiency anaemia, probably due to your heavy periods.

根据血液检查，说明你得的是缺铁性贫血，可能和你的月经过多有关。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。