1.
Flared type tube fittings--Union cross--Assembly
GB/T5641.1-1985扩口式四通管接头
2.
Flared type tube fittings--Union cross--Body
GB/T5641.2-1985扩口式四通管接头体
3.
Union cross-Assembly
GB/T3746.1-1983卡套式四通管接头
4.
Finite Element Simulation and Technique Analysis of X-joints Hydroforming Process;
四通管内高压成形有限元模拟及工艺分析
5.
X-joint Tube Hydroforming Processing Analysis Based on FEA
基于有限元仿真的四通管内高压成形工艺分析
6.
axial flow resnatron
轴向通量分米波超高功率四极管
7.
Simulation for structure capability of TC type four-channel coal burner
TC型窑用四通道喷煤管结构性能仿真
8.
General Equipment Maintenance Management Organization Structure Design under the Construction Mode of "Four Match Four All"
通用装备“四合四统”建设模式下维修管理组织结构设计研究
9.
Malleable cast iron pipe fittings--Type size--Crosses
GB/T3289.20-1982可锻铸铁管路连接件型式尺寸四通
10.
Malleable cast iron pipe fittings--Type size--Reducing crosses
GB/T3289.21-1982可锻铸铁管路连接件型式尺寸异径四通
11.
Design of the Communication Tower with the Composite Structure of the Square-shaped Steel Tube and Angle Steel
四边形钢管角钢组合结构通信塔的设计
12.
Design and Realize of Integrated Network Management System for Sichuan Unicom Mobile Network;
中国联通四川分公司综合网管系统设计与实现
13.
General Situation and Thinking of Emergency Telecommunication Construction in SEPC
四川省电力公司应急通信建设管理概况及思考
14.
Study on Acoustic Transmission Loss in 4-channel Impedance Tube with Single-sensor
单传声器四通道驻波管隔声量的测试研究
15.
Research on Management Innovative of Sichuan Tourism and Transportation Sustainable Development
四川旅游交通运输的可持续发展管理创新研究
16.
4. Development of Information and Telecommunications Systems
（四）信息通信建设
17.
Coordinate mllitary and police organization in advance to enforcer traffic control along the transport route and preclude road barriers.
四预先协调军警机构于沿途实施交通管制及排除道路障碍。
18.
Phase 4 is approximately 7.5 km of hydrant pipe for the second new terminal.
四期是大约7.5公里的消防管线，通往第二个新的终端设备区。