单选题The mechanical exhaust valve operation system is replaced by（）in an electronic controlled ME engine.Aa system with a Hydraulic Power Supply (HPS) unitBa system with roller guides for exhaust valvesCa system with an electronically controlled Alpha LubricatorDa system directly powered by electric motor
单选题
The mechanical exhaust valve operation system is replaced by（）in an electronic controlled ME engine.
A
a system with a Hydraulic Power Supply (HPS) unit
B
a system with roller guides for exhaust valves
C
a system with an electronically controlled Alpha Lubricator
D
a system directly powered by electric motor
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