1)  String type

2)  three-port oscillator

3)  tri-port sinusoidal oscillator

4)  Transversal [英][træns'və:səl]  [美][træns'vɝsḷ]

1.
Compute the Damping Ratio with Method of Transversal;

5)  midpoint chord

1.
This article advances an extraction which is easy t0 use and rememberabout 8The straight line equation of midpoint chord of conic secti0n .

2.
Problems about the existence of midpoint chord of quadratic curve is worthy of discussing in the study of the theories about quadratic curve.

3.
In plane analytic geometry, learners often meet some problems which need to be solved, such as, solving the midpoint chord of quadric curve, solving the midpoint of chord, solving the length of chord and giving a certain chord, and solving the conjugate diameters about the chord, etc.

6)  chord at contact

1.
In this paper,two theorems on chord at contact equation of a nonsingular conic have been proved.

 代码：00413设备名称：闭式单点、双点压力机型号规格：公称力≥800kN 计量单位：台

（一）加工精度
参照GB10924-89、GB10933-89、JB5200-91
1、滑块下平面对工作台上平面的平行度（mm）
30%精度储备20%精度储备达到规定值大于规定值
0.02+0.10/100×滑块下平面的被测长度

2、滑块行程对工作台上平面的垂直度
30%精度储备20%精度储备达到规定值大于规定值
0.05+0.02/100×滑块行程长度

（二）结构性能

1、离合器、制动器接通率，当滑块行程次数≤16次/分时为70%，≤25次/分时为60%，≤45次/分时为50%

2、液压超负荷保险装置、微调装置、吨位指示器

（三）噪声dB（A）

1、公称力≤400kN
≤85≤87≤88＞88
2、公称力＞400kN
≤87≤88≤90＞90