which one of the following statements is true? a) both electric power steering motors and a/c compressors are high-voltage devices. b) only positive high-voltage wiring is colored orange, since the vehicle chassis is used as the ground side (negative side) of the circuit. c) in atkinson cycle ic engines, the compression ratio and the expansion ratio are exactly the same. d) the high-voltage battery pack contains many 1.2 volt cells wired in series.