王师傅原来5分钟加工一批零件，技术更新后2分钟就完成了任务。他的工作效率提高了请选择ABC6O:z9F6{;F7|'o1j3d6s0q3I5H3p*A:W
A．60%;F7|'o1j3d6s0q3I5H3p*A:W
B．150%;F7|'o1j3d6s0q3I5H3p*A:W
C．250%;F7|'o1j3d6s0q3I5H3p*A:W