安装在异丙醇泵出口管线上的阻尼器的作用是（）。
参考答案：缓冲管线上的压力波动
You are creating something out of nothing, ________ means, in one sense, ________ none of it is true.
A．that; that
B．which; that
C．which; which
D．that; which
对纳税人采取税收保全措施，必须经税务机关向人民法院提出申请后，由人民法院执行。 ( )
