船舶主推进装置1..3船舶推进装置1..3.1推进装置的传动方式In reducing engine speed to an efficient propeller speed by the use of reduction gears,（）.

A、speed and torque are both reduced
B、speed is reduced and torque remains unchanged
C、speed is reduced and torque is increased
D、speed is sometimes unchanged while torque is increased

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In reducing engine speed to an efficient propeller speed by the use of reduction gears,( )

A、speed and torque are both reduced
B、speed is reduced and torque remains unchanged
C、speed is reduced and torque is increased
D、speed is sometimes unchanged while torque is increased

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In reducing engine speed to an efficient propeller speed by the use of reduction gears,_________.（易）

A、 speed and torque are both reduced
B、 speed is reduced and torque remains unchanged
C、 speed is reduced and torque is increased
D、 speed is sometimes unchanged while torque is increased

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