In the1980s, American farmers entered a period of economic difficulty.

The Analysis of Technical Difficulty and Project Practice in Foundation Pit Design and Construction

深基坑工程设计施工中技术难点分析与工程实践

This also lies the technical difficulty of the project.

这也是本工程的重要技术难点。

However, the technical difficulty of the hole density perforating.

然而，高孔密射孔器的技术难度相对较大。

However, its technical difficulty and construction more difficult, economic indicators have also increased.

但是，其技术难度和施工难度加大，经济指标也加大。

Noise Analysis of Differentiator Amplifier and Consideration to Application of Low Noise

差分放大器的噪声分析及低噪声运用考虑

Theoretical analysis and numerical examples show that the marching method is valid if the eigenvalues of the two-order partial differentiation operator is exactly approximated.

理论分析及数值实例显示，如果离散格式能够精确逼近二阶偏导算子的特征值，步进方法对高频波传播计算是有效的。

The dynamic coefficients of tilting pad guide bearings are derived with the help of finite-elements using pressure parameters partial differentiation.

本文采用有限元法，利用压力参数法和偏导数法直接推求分块可倾瓦导轴承的动力特性系数。

The method of harmonic balance is applied to study the non-linear dynamic response of the third-order nonlinear partial differentiation system.

应用谐波平衡法对系统三阶非线性微分方程组解析分析，与数值解比较验证了解析解的正确性和有效性。

The order of partial differentiation is immaterial.

偏微商的次序并不重要。

Solving Center of Plane Central Curve with Positive Integer Degree by Partial Differentiation

偏微分法求平面正整数次中心曲线的中心

The Function Differential, Partial Differentiation, Grads, Divergence, and Curl in Mizar

函数的微分、偏微分及梯度、散度、旋度在Mizar语言下的实现

The Analysis of Grinding Technological Parameters for Non-blade Reamer Base on Partial Differentiation

基于偏微分法的无刃铰刀刃磨参数的分析

Conclusion A new VL 30 like gene is identified for the first time in MEL cells during chemical inducing erythroid differentiation.

结论在MEL细胞红系分化过中发现了一种新的VL30样基因。

The effects of physical and chemical factors on differentiation and growth of green globular bodies of NEPHROLEPIS cordifolia

若干理化因子对日本肾蕨绿色球状体分化及生长的影响

Objective: To make a physical and chemical differentiation of Cuscuta Chinensis and its fake-Brassicca Juncca seeds.

目的：对菟丝子及其伪品芥菜种子进行理化鉴别。

Objective: To seek the basis for the physical and chemical differentiation between A.

前言：目的：研究独活及其伪品的理化鉴别依据。

Three types of IM present different differentiation phase in morphology and mucin secretive function, which suggests that heterogeneity of IM is substantially a dynamic and progressive change.

三型肠化形态学和粘液分泌功能表达上呈现为不同的分化阶段，提示肠化的异质性具体表现为肠化是一个动态的过程。

In inflorescence primordium differentiation phase, the content of polysaccharide was little, while protein was rich and distributed uniformly.

在花序原基分化期，细胞中多糖的含量较少，而蛋白质含量丰富且整体分布均匀。

Pistil Differentiation Phase;

雌蕊分化期；

Petal Differentiation Phase;

花瓣分化期；