Mechanical power is produced by electric motors that are mainly used to drive pumps, for example, fuel and hydraulic pumps or to drive *a valve to the commanded position in the fuel, hydraulic or air conditioning system or to move mechanical parts like doors and cargo containers.机械动力是由电机产生 的，主要用于驱动泵，例如燃料泵和液压泵，或驱动阀门到燃料、液压或空调系统的命令位置，或移动机械 部件，如门和货物集装箱。
A.You can electric motors drive fuel and hydraulic pumps or to drive a valve to the commanded position in the fuel, hydraulic or air conditioning system or to move doors and cargo containers. B.Electric motors' can drive fuel and hydraulic pumps or drive a valve to the commanded position in the fuel, hydraulic or air conditioning system or move mechanical parts like doors and cargo containers to produce mechanical power. C.Electric motors produce mechanical power and their main functions are to drive fuel and hydraulic pumps, to drive a valve to the commanded position and to move mechanical parts like doors and cargo containers.正确答案C
