A clearly visible beneath of RT-flex engines is their operation at all ship speedsThis is achieved by the superior combustion performance（）<br>A:shockless<br>B:smokeless<br>C:no vibration<br>D:noiseless

A clearly visible beneath of RT-flex engines is their operation at all ship speedsThis is achieved by the superior combustion performance（）
A:shockless
B:smokeless
C:no vibration
D:noiseless

出自：海船船员证

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