A、high speeds
B、medium speed
C、low speeds
D、the same speed with the engine
更多“Propeller running at （） are generally efficient.”相关的问题
A、A.more efficiently uses available engine power B、B.operates at a lower efficiency at a fixed speed C、C.produces the same torque at lower engine power D、D.develops its rated power at a lower speed
A、A.more efficiently uses available engine power B、B.operates at a lower efficiency at a fixed speed C、C.produces the same torque at lower engine power D、D.develops its rated power at a lower speed
A、Any leaks in piping, propeller shaft, machinery, tanks, will have to be repaired on the spot B、Any leaks in piping, propeller shaft, machinery, tanks, will have to be repaired on the next port of call C、Any leaks in piping, propeller shaft, machinery, tanks, will have to be repaired until the next stop D、Any leaks in piping, propeller shaft, machinery, tanks, will have to be at least patched up
A、reduce the fuel feeding of main engine of inner propeller B、reduce the fuel feeding of main engine of outer propeller C、firstly reduce the fuel of main engine of inner propeller, then reduce the fuel feeding of engine of outer propeller D、reduce fuel feeding of two engines at the same time
A、walk the stern to starboard in reverse B、walk the stern to port in reverse C、run faster than a left-handed propeller D、right itself if capsized
A、walk the stern to starboard in reverse B、walk the stern to port in reverse C、run faster than a lefe-handed propeller D、right itself if capsized
A、A.built up propeller B、B.solid propeller C、C.controllable pitch propeller D、D.suction back propeller
A、A.back current from the rudder B、B.greater pressure on the right or left side of the propeller，depending on rotation C、C.lower pressure on the right or left side of the propeller，depending on rotation D、D.torque from the velocity and angle at which the surrounding water impinges upon the propeller blades
A、Slightly higher fuel consumption B、Lack of directional control when backing C、Inefficient at high shaft RPM D、Some unusual handling characteristics
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