Both pressure wave speed and attenuation were measured under different disturbed frequency with pressure transducers mounted flush to the pipe wall. In the bubbly flow, the results show that both the pressure wave speed and attenuation have close relation with the disturbed frequency.
实验结果表明,对泡状流,在实验范围内,压力波的传播速度及其衰减跟扰动频率有关,随着扰动频率的增加,波速及其衰减都增加;
Both the attendance machine and external card reader are mounted on the wall. A mental wall or gate will shorten greatly the distance to punch card, even make it unable to work.
本考勤机和外置的打卡头都是安装在墙壁上使用的,但是如果安装在金属墙壁或金属门上,将明显缩短打卡距离,甚至完全不能打卡。
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