[填空题]
The current in an electromagnet connected tyjje , , mkytev rk.0i/fr./,st h(,me 9zi8gn xl+mo5o a 240-V line is 17.5 A. At what rate must cooling water pass over the coils if the water temperature is to rise8g( 9e5ohim+t nlxm ,z by no more than 7.50 $C^{\circ}\,$? kg/s
