9.船員受僱上船服務,應檢具經公立醫院體格檢查合格之證明書,該項證明書有效期限為幾年?
(A)4
(B)3
(C)2
(D)1
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統計: A(10), B(76), C(615), D(54), E(0) #2015006
統計: A(10), B(76), C(615), D(54), E(0) #2015006