【简答题】Fourth of July - English to C h inese 1. Life's challenges are not supposed to paralyze you; they're supposed to help you discover who you are. 2. I am not supposed to be commanding this Army -- I am ...
【简答题】A centrifugal pump with a double inlet rotor is of a type used for many duties where a large capacity output is required. As the forces acting on either side of the rotor are the same, no thrust actio...