Which of the following findings is suggestive of myocardial infarction (MI)

A. Below-normal erythrocyte sedimentation rate.
B. Elevated white blood cell count.
C. Elevated serum cholesterol value.
D. Elevated creatine phosphokinase (CPK) valu

MG46DW型电牵引采煤机电气系统的控制部分可实现________控制、________控制、________控制，以及________保护、________保护、___________保护。