（） is made of a boss with separated blades mounted into it.<br>A:A variable pitch propeller<br>B:A variable pitch nut<br>C:A fixed pitch parallel<br>D:A fixed pitch screw

（） is made of a boss with separated blades mounted into it.
A:A variable pitch propeller
B:A variable pitch nut
C:A fixed pitch parallel
D:A fixed pitch screw

出自：海船船员证

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