When the propeller blades are integral with the hub, the propeller is called a _____.A.bui

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

请帮忙给出正确答案和分析，谢谢！

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