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8. In a way we may say that our posture acts like a “_______________”, who is ready to send any message out in spite of its likely consequences.
答案：
messengerIn a way we may say that our posture acts like a "m...
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超声波气体流量计Ultrasonic gas flowmeter工作原理working principle： 在管道的一侧或两侧嵌置两个能发射和接收声脉冲的探头。采用超声检测技术，通过测量超声波沿气流顺向和逆向传播的声速差、压力和温度，算出气体流速及标准状态下气体的流量。Two probes capable of transmitting and receiving acoustic pulses are positioned on one or both sides of the pipe. Ultrasonic detection technology is adopted to calculate the gas velocity and flow rate under standard state by measuring the sound velocity difference, pressure and temperature of ultrasonic wave propagating along the flow direction and backward.
超声波气体流量计Ultrasonic gas flowmeter工作原理working principle： 在管道的一侧或两侧嵌置两个能发射和接收声脉冲的探头。采用超声检测技术，通过测量超声波沿气流顺向和逆向传播的声速差、压力和温度，算出气体流速及标准状态下气体的流量。Two probes capable of transmitting and receiving acoustic pulses are positioned on one or both sides of the pipe. Ultrasonic detection technology is adopted to calculate the gas velocity and flow rate under standard state by measuring the sound velocity difference, pressure and temperature of ultrasonic wave propagating along the flow direction and backward.
答案：
超声波气体流量计的工作原理基于测量超声波在气体中顺流和逆流传播时的速度差异。这种流量计通常在管道的两侧安装两个探头，这两...
