题目

Stop wasting your time thinking of reasons for your failures.  Instead, realize that the seeds of success were planted within you when you were born. Only you have the power to make those seeds grow.  The seeds, and the power to grow them, are contained in the most awesome machine ever created: the human mind. Success is a choice and not a chance. You were born a winner. You were born rich. You can be a success if only you make the right choice. You cannot be successful without first developing your self-confidence. Your level of self-confidence is always based on the degree of下列有关燃料电池的说法正确的是（　　）A．氢氧燃料电池可将热能直接转变为电能B．燃料电池的能量转化率可达100%C．氢氧燃料电池工作时氢气在负极被氧化D．以KOH溶液为电解质溶液的氢氧燃料电池，正极反应为O2+2H2O+4e-=4OH-