单选题When the propeller blades are integral with the hub, the propeller is called a （）.Abuilt up propellerBsolid propellerCcontrollable pitch propellerDsuction back propeller
单选题
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
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