【单选题】If the characteristic equation of pipeline can be written as He '= 10.2 + 0.313V 2 [m] (V—m 3 / h). If the“He ~ V”relationship of the selected pump can be expressed as He = 42-0.01V 2 [m], then the op...
【简答题】阅读理解 Hi, I'm Tina. This is a photo of Class 18.This class has twenty-five students, twelve girls and thir boys. These are Amy and Bob. Amy is Bob's sister. Amy is 12 and Bob is 13. Amy likes Engli...