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【单选题】
抗寄生虫药使用的原则有( )甲.尽量选择、高效、低毒、便于投药、价格便宜、无残留或残留、不易产生耐药性的药物 乙.必要时联合用药 丙.准确地掌握剂量和给药时间 丁.混饮投药前要禁饮、混饲前应禁食、药浴前要多饮水 戊.大规模用药时必须做安全试验,以确保安全 已.食品动物用药要注意休药期和残留问题A.
甲乙
B.
甲
C.
甲乙丙丁
D.
甲乙丙丁戊
E.
甲乙丙丁戊已
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【单选题】They were ahead during the first half of the match, but they ________ in the last five minutes．
A.
were beating
B.
beat
C.
were beaten
D.
had been beaten
【简答题】We were ahead during the first half of the match， but we ______ in the last ten minutes. (A)lost (B) have lost (C) were losing (D) had lost
【单选题】During the first half of the seenth century, when the nations of Europe were quarreling over who owned the New World, the Dutch and the Swedes founded competing villages ten miles apart on the De...
A.
Convenience for traffic.
B.
The Delaware River.
C.
The investment of Irenee DuPont.
D.
The textiles mills.
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