33. What is the purpose of the Controllable-Pitch Propeller (CPP) hydraulic oil power system?

Supplies high-pressure oil for blade actuation and control oil for propeller pitch control.
Supplies high-pressure oil for both propeller blade actuation and stern tube sealing.
Supplies low-pressure oil for propeller blade actuation and control oil for propeller pitch control.
Supplies low-pressure oil for both pitch control and stern tube sealing.

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