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【单选题】
抗寄生虫药使用的原则有( )甲.尽量选择广谱、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.
甲乙丙
C.
甲乙丙丁
D.
甲乙丙丁戊
E.
甲乙丙丁戊已
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【简答题】根据句意，用所给单词的适当形式填空。 lie song be interesting candle 1. —How long _______ the movie on in Kunming last month? —Seven days. 2. Jane can sing some Chinese _______. 3. I like English ...
【单选题】Which of the following is TRUE?
A.
The robber fired a shot to make the customers lie on the floor.
B.
The robber fired the gun after he loaded it.
C.
The robber didn't fire the gun because it wasn't loaded.
D.
The robber didn't fire the gun although it may be loaded.
【单选题】We saw piles of goods containers lie on the port, away .
A.
waited to be carried
B.
to wait to carry
C.
waiting to be carried
D.
and waited for carrying
【简答题】Most cities in the _______ River Delta lie on flat land, and so when building gardens, mountains and ponds have to be created by man.
【简答题】食品的酸度通常用总酸度(滴定酸度)、挥发酸度、有效酸度来表示，测定方法分别为直接/酸碱滴定法、();()。
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