three-level section

Three rats were executed respectively on postoperative 1, 2 and 4 weeks to conduct tissue section examination.

于手术后第1,2,4周时各取1只大鼠麻醉状态下处死，作组织切片检查。

The cross-country section of the three-day event was held here yesterday.

3日比赛中的越野项目昨天在这里举行。

The three-level teaching and research section in China is unique.

三级教研组织是中国的一枝独秀。

Based on strict and precise mathematical models, flow field and dynamic characteristics of pure water big flow three-way valve are studied, dangerous section of key parts are analyzed, whose safety coefficients are all above 2.

通过建立严密而精确的数学模型，研究了纯水大流量三用阀的流场和动态特性，分析了纯水大流量三用阀的关键零部件容易出现的危险截面，其安全系数均在2以上。

Main thesis is divided into three major parts: The first section describes the real estate investment trusts basic principles.

论文主体分为三大部分：第一部分介绍了房地产投资信托的基本原理。

On this basis, the three-slab cross section of through-traffic highway has been presented, which can partially lessen the roadside interference on through-traffic highway and can greatly increase the driving speed of vehicles.

在此基础上，提出三块板式的过境公路横断面形式，可以部分解决过境公路的路侧干扰，较大地提高车辆运行速度。