The Wartsila RT-flex and MAN Diesel& Turbo()ME engine designs offer similar approaches to the electronic control of starting air and also to the electronic control and ____operation of the exhaust valve. A: mechanical B: Pneumatic C: hydraulic D: automatic

The Wartsila RT-flex and MAN Diesel& Turbo（MDT）ME engine designs offer similar approaches to the electronic control of starting air and also to the electronic control and ____operation of the exhaust valve. A: mechanical B: pneumatic C: hydraulic D: automatic