21. 3'- 10 "之長度等於多少公釐?
(A)142.24mm
(B) 22.4 mm
(C) 116.84 mm
(D) 1168.4 mm
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統計: A(49), B(18), C(334), D(1063), E(0) #1821601
統計: A(49), B(18), C(334), D(1063), E(0) #1821601