单选题A diesel engine is operating at 1800 RPM and driving a propeller at 600 RPMWhat is the speed reduction ratio?（）A030 to 1B300 to 1C333 to 1D330 to 1
单选题
A diesel engine is operating at 1800 RPM and driving a propeller at 600 RPMWhat is the speed reduction ratio?（）
A
030 to 1
B
300 to 1
C
333 to 1
D
330 to 1
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