闭合循环的热媒回路? 在一个闭合循环的热媒回路中,热媒泵与供热设备之间的位差25m,循环回路管道阻力降总计350kPa。已知热媒在工作温度下的密度为815kg/m3,该泵工作状态下的扬程(m)是下列哪个数值? A 53 B 69 C 41 D 44 应该选B, 答案是D 查看更多2个回答 . 4人已关注
谁给翻译: ultrasonic examination? ultrasonic examination ultrasonic examination may replace radiograohy in accordance with ASME B31.3 ,para.341.41. if ultrasonic examination is applied,automated computer enhanced data accquisition is required to abtain a permanent record of the weld to demonstrate the sbsence , or not,of liner type discontinuities with amplitudes exceeding the reference level查看更多14个回答 . 4人已关注