27. One kind of elements which are in common use for daily maintenance works on the ship is a shaft with a helical thread or groove on its surface with provision on its one end. It is mainly used as a threaded fastener to hold objects together. What element is above description?
(A) Caliper
(B) Washer
(C) Solder
(D) Screw

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統計： A(30), B(41), C(12), D(47), E(0) #1781599