When the propeller blades are integral with the hub, the propeller is called a （）.<br>A:built up propeller<br>B:solid propeller<br>C:controllable pitch propeller<br>D:suction back propeller

When the propeller blades are integral with the hub, the propeller is called a （）.
A:built up propeller
B:solid propeller
C:controllable pitch propeller
D:suction back propeller

出自：海船船员证

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