1.
Structure Design and Analysis for Draft Sill and Body Bolster of Class 70t Stub Sill Tank Car;
70t级无中梁罐车牵枕结构设计及分析
2.
Design and Research on 70t Loading Capacity 3×20ft Container Flat Wagon;
70t级3×20ft新型集装箱平车的研制
3.
Anti-Fatigue Design on 70t New Type General Purpose Use Open Top Wagon Based on Virtual Model Machine Technology;
基于虚拟样机技术的70t级新型通用敞车抗疲劳设计
4.
Improve the Repair Stations Dealing with Faults 70 t Class Truck Repair Facilities and Faults Countermeasures
提高站修所处理70t级货车故障及施修的几点对策
5.
Melting Process Optimization of 70t UHP Electrical Arc Furnace
70t超高功率电弧炉冶炼工艺优化
6.
Process Practice of a 70 t High Impedance UHP Electric Arc Furnace
70t高阻抗超高功率电弧炉的工艺实践
7.
Magnet Cooling Model of the 70T Strong Pulse Magnetic Field in Low Temperature and Experiment Research;
70T脉冲强磁场磁体低温冷却模型与实验研究
8.
Practice of Removal And Transforming LF-70t Refinery Furnace in Masteel;
马钢三钢轧LF-70t钢包精炼炉迁移改造实践
9.
Class, class, class;
班级，班级，班级；
10.
Skip from the fourth to the sixth grade.
从四年级跳级到六年级。
11.
Starter , Standard, Professiona
入门级, 标准级, 专业级
12.
(3) the lower level is subordinate to the higher level;
（三）下级服从上级；
13.
Demote from
降级，降职，使……降级。
14.
Triple A [3A ] 3A
级，最佳债券评级［
15.
director of bureau [directorate rank]
局长〔首长级职级〕
16.
Schools in the army are divided into those at higher, middle and lower levels.
学校有各级的：高级，中级，初级。
17.
They should also have middle-and lower-level schools.
还有中级的、初级的。
18.
The boy was kept back in the fourth grade.
男孩在四年级时留级。