The key feature of the Sulzer RT-flex system is that it gives complete freedom in the and operation of fuel injection and exhaust valve actuation（）<br>A:metering<br>B:control<br>C:using<br>D:timing

The key feature of the Sulzer RT-flex system is that it gives complete freedom in the and operation of fuel injection and exhaust valve actuation（）
A:metering
B:control
C:using
D:timing

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