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
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某凝液收集罐,罐外部保温,凝液温度为90℃,该罐设计温度为
A. 120
B. 90
C. 100
D. 130
某气—液相反应,其过程为化学反应控制,化学反应在整个液相中进行,并且反应速度较慢,反应热比较大,则优选的反应器结构形式是
A. 固定床反应器
B. 鼓泡塔式反应器
C. 列管式反应器
D. 喷射式反应器
The table shows the impressive performance of two uranium mining companies on the Australian stock market. Make sentences about the data using the words given. Make sure you use the correct prepositions.PriceAus$JanFebMarAprMayJunFormetalUromin3.62.44.22.84.23.24.23.04.83.75.43.6 stood / January Uromin shares stood at $2.4 in January. stayed / the same level / three months
Complete these statements by putting a verb (gerund or infinitive) into each gap. Are you able to repair the fault or not If not, I will go to another garage. Stop ______. Everything will be alright.