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試卷名稱：103年 - 103 警察特種考試_三等_消防警察人員：消防警察專業英文#45786
年份：103年
科目：警察◆三四等◆消防警察專業英文
47 Although production of Halon 1301 and Halon 1211 was discontinued in 1994, systems and
extinguishers were permitted to remain in service until suitable replacement agents were available.
(A)substitute
(B)existing
(C)alternative
(D)complement
