Electromagnetic absorbing materials with high frequency and high loss are required to absorb the noise energy, aiming at restraining the electromagnetic leak induced by high-frequency emission noise.
为了抑制高频发射噪声引起的电磁波泄漏，就需要开发频率高损耗大的电磁波吸收材料，有效地吸收噪声能量。
It is shown that the testing machine has advantages of low production cost, compact structure, high accuracy, stable and reliable, high efficiency, energy saving, and low noise, etc.
结果表明，该试验机具有制造成本低、结构紧凑、测试精度高、工作稳定可靠、效率高、节能、噪声小等优点。
B shaped bellow features high degree of supercooling, Iow noise, good performance in energy-saving. It is ideal environment-caring trap.
该阀B型膜盒过冷度大、排水温度低，噪音小，是环保型的理想疏水阀，节能效果显著。
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