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- A new type of sound absorbing materials mainly made from low alkaline cement and expanding pearlite has been investigated on the basis of sound absorption principle. 摘要以低?A水泥和膨胀珍珠岩为主要原料,辅之以分散性良好的增强剂聚丙烯纤维,研制出一种新型吸声材料。
- A new type of sound absorbing material was made from super-strength gypsum and glass fiber and the sound absorp-tion coefficient of the material was tested by standing wave tube method. 以高强石膏为主要原料,内掺玻璃纤维,在发泡剂的作用下,制备出一种新型多孔吸声材料,采用驻波管法测试材料的吸声系数。
- effective porosity of sound absorbing materials 有效空隙率
- The convoy commodore sees to the internal management of the convoy. 舰队司令官负责管理舰队的内部问题。
- When did the first measurement of the speed of sound take? 第一次测量声速是在什么时候?
- Every paragraph is a distillation of sound judgment. 每段话都是正确判断的结晶。
- Equivalent Specific Acoustic Resistance of Sound Absorbing Materials 吸声材料的当量声阻率
- Airliners in service at present cannot fly faster than the speed of sound. 目前供使用的客运机飞行速度不能超过音速。
- Characterized by high volume and intensity. Used of sound. 大声的以高音量和强烈为特征的。用于声音
- Application of sound absorbing performance for casting porous aluminum alloy 铸造多孔铝的吸声性能与应用
- I want a say in the management of the business. 我想要在业务管理方面有决定权。
- Our teacher has mutation of sounds suddenly. 我们的老师突然语音发生了变化。
- Changes in top management of the company had been in the wind for weeks. 公司高层管理的人事变动已进行好几个星期了。
- Mach two equals twice the speed of sound. 二马赫相当于声速的二倍。
- Storage and management of airline empty ULD. 提供航空公司集装板存储服务。
- His distinction of sound is excellent. 他辨别声音的能力很强。
- He was given overall management of the program. 他负责项目的全面管理。
- Wood is a poor conductor of sound. 木头是声音的不良导体。
- His wife is a prudent manager of money. 他妻子是一位审慎的理财人。
- Mr. Smith is the manager of our local pub. 史密斯先生是我们本地酒吧的经理。