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18. The used microstrip interconnects have the following characteristics: various characteristic impedance, length, dielectric thickness and relative dielectric permittivity. The used other kinds of transmission lines are chosen to achieve the comparison: grounded co-planar waveguides, striplines, coated-microstriplines. The analysis is mainly based on experiment measures which incorporated 3D full-wave EM simulation in frequency and time domain. Then the differential microstrip line and stripline will be analyzed on signal integrity by used mixed-mode S-parameters based on 3D EM simulation in frequency domain.3. Various discontinuities in high-speed interconnects will be analyzed on signal integrity.
主要基于實驗研究，并結(jié)合三維全波電磁仿真軟件在頻域和時域?qū)Ω咚倩ミB中常見的不同特性阻抗、長度、PCB板厚度、PCB板介電常數(shù)的微帶互連線以及不同類型的傳輸線，如：接地共面波導、帶狀線和嵌入式微帶線的信號完整性性能進行分析，并對接地共面波導的諧振現(xiàn)象和傳輸特性進行了詳細的理論分析；然后采用混合模S參數(shù)的理論對高速互連中常用的差分微帶線和差分帶狀線的信號完整性性能進行頻域的仿真分析。3。

19. In order to reduce the expend of the development of TV guidance bomb, it refits the servo actuators of some missile for the servo actuators of the pitching loop and the yawing loop, and then, it tests the characteristic of the actuators and makes the actuators satisfy the basic requests; for the tumbling loop, the servo actuator adopts three-position relay control fashion to make the loop be stable by using the relay control circuit, the three-position and five-passage valve and the gas amplification device.
為了降低電視制導炸彈的成本，對于俯仰、偏航穩(wěn)定回路，采用某型號導彈的舵機進行改裝，并對改裝后的舵機的特性進行測試，使舵回路達到一定要求；對于滾轉(zhuǎn)穩(wěn)定回路，采用三位置繼電控制舵，通過繼電放大器、三位五通閥和氣動放大器來控制舵面的偏轉(zhuǎn)，以此來實現(xiàn)滾轉(zhuǎn)穩(wěn)定。

20. This copper aluminum tube welding process process and the characteristic, the welding process process decomposition will be 6 movements, contains the movement is the translation, according to the copper aluminum tube welding machine's practical work demand, analyzes electric circuit's principle of work, designs the PLC peripheral circuit, based on this, designs the complete control procedure, and carries on the simulation debugging.
本銅鋁管焊接工藝過程及其特點，將焊接工藝過程分解為6個動作，其中包含的運動均為直線運動，根據(jù)銅鋁管焊機的實際工作需求，分析電路的工作原理，設(shè)計PLC外圍電路，在此基礎(chǔ)上，設(shè)計完整的控制程序，并進行模擬調(diào)試。

1. be characteristic of的解釋

1. The civilization of a nation can be seen in all areas, each bearing the unique characteristic of the nation.

2. But instead of arrows, visitors will be bombarded with my favorite " Chinese characteristic ".

3. Since the end of March, 13 characteristic streets started to be constructed.

4. These characteristic performances are likely to be held in 37 venues to ensure that most of the audiences can have a chance to watch.