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2岁左右羊群，夏季放牧时，陆续出现发病死亡。大多未见临诊症状而突然死亡。少数病例病程稍长的，出现体温升高达41.5℃左右，呼吸高度困难，掉群，食欲废绝，皮肤呈紫黑色，很快呈昏睡俯卧，病畜并保持在这种状态下毫无痛苦地死去，死后全身皮肤发黑。病程可达1～2d，但不超过3d该病最可能的诊断是（ ）A、羊肠毒血症 B、羊快疫 C、羊猝疽 D、疫 E、羔羊痢疾 如果你的诊断正确，在对病死病理剖检时常会发现肝脏（ ）A、有脓肿 B、大面积出血 C、大面积液化性坏死 D、有界限清晰的凝固性坏死灶 E、破裂 对该病的防控措施是（ ）A、控制肝片吸虫感染，定期预防注射 B、定期预防注射 C、停止放牧，实行圈养 D、停止饲喂精料，紧急预防注射 E、定期消毒，停喂青草
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举一反三
【单选题】What does the author think about the relationship between a new though t and its being put into practice?
A.
It’s more difficult to create a new thought than to apply it in practice.
B.
To find a new thought will definitely lead to the production of a new thing.
C.
One may come up with a new thought, but can not put it into practice.
D.
A man with an excellent ability of practice can easily become an inventor.
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【判断题】When the author asked Spender what the most beautiful line he thought was, Spender wrote the line of T. S. Eliot’s on the blackboard.
A.
正确
B.
错误
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【单选题】DNA聚合酶有两种方式保证复制的准确性，即选择性添加正确的核苷酸和移除错配的核苷酸。某些突变的DNA聚合酶（突变酶）比正常DNA聚合酶催化的精确度更高。下列有关叙述正确的是（）
A.
突变酶中的氨基酸序列没有发生改变
B.
突变酶作用的底物是四种核糖核苷酸
C.
突变酶极大地提高了DNA复制的速度
D.
突变酶降低了基因突变频率不利于进化
查看完整题目与答案
【判断题】When the author asked Spender what he thought was the most beautiful line in the English language, Spender wrote the line of T. S. Eliot.
A.
正确
B.
错误
查看完整题目与答案
【单选题】According t o the author, housework is thought of as a very dreary grind because __________
A.
it is both dull and tiring
B.
it is so hard and dirty
C.
it is the hardest of all routine jobs
D.
it hardly gets any of the praise it deserves
查看完整题目与答案
【简答题】This song raised us a question: what attitude of ours toward relationship and life in the world should be? In the song the author described psychological change of his opinion from disbelieving to bel...
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【简答题】The author thought that grade-three thinkers were numerous and mustn’t be overlooked.A. T B. F
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【单选题】The author thought that grade-three thinkers were numerous and mustn’t be overlooked.
A.
T
B.
F
查看完整题目与答案
【判断题】Since the author needed business-oriented education, he thought about starting his own business. (T/F)
A.
正确
B.
错误
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【单选题】DNA 聚合酶有两种方式保证复制的准确性,即选择性添加正确的核苷酸和移除错配的核苷酸。某些突变的 DNA 聚合酶 ( 突变酶 ) 比正常 DNA 聚合酶催化的精确度更高。下列有关叙述 不 正确的是 ( )
A.
．突变酶中的氨基酸序列可能发生了改变
B.
．突变酶对 DNA 复制的速度可能没有影响
C.
．突变酶增加了基因突变频率有利于进化
D.
．突变酶作用的底物是四种脱氧核糖核苷酸
查看完整题目与答案
相关题目：
【单选题】What does the author think about the relationship between a new though t and its being put into practice?
A.
It’s more difficult to create a new thought than to apply it in practice.
B.
To find a new thought will definitely lead to the production of a new thing.
C.
One may come up with a new thought, but can not put it into practice.
D.
A man with an excellent ability of practice can easily become an inventor.
查看完整题目与答案
【判断题】When the author asked Spender what the most beautiful line he thought was, Spender wrote the line of T. S. Eliot’s on the blackboard.
A.
正确
B.
错误
查看完整题目与答案
【单选题】DNA聚合酶有两种方式保证复制的准确性，即选择性添加正确的核苷酸和移除错配的核苷酸。某些突变的DNA聚合酶（突变酶）比正常DNA聚合酶催化的精确度更高。下列有关叙述正确的是（）
A.
突变酶中的氨基酸序列没有发生改变
B.
突变酶作用的底物是四种核糖核苷酸
C.
突变酶极大地提高了DNA复制的速度
D.
突变酶降低了基因突变频率不利于进化
查看完整题目与答案
【判断题】When the author asked Spender what he thought was the most beautiful line in the English language, Spender wrote the line of T. S. Eliot.
A.
正确
B.
错误
查看完整题目与答案
【单选题】According t o the author, housework is thought of as a very dreary grind because __________
A.
it is both dull and tiring
B.
it is so hard and dirty
C.
it is the hardest of all routine jobs
D.
it hardly gets any of the praise it deserves
查看完整题目与答案
【简答题】This song raised us a question: what attitude of ours toward relationship and life in the world should be? In the song the author described psychological change of his opinion from disbelieving to bel...
查看完整题目与答案
【简答题】The author thought that grade-three thinkers were numerous and mustn’t be overlooked.A. T B. F
查看完整题目与答案
【单选题】The author thought that grade-three thinkers were numerous and mustn’t be overlooked.
A.
T
B.
F
查看完整题目与答案
【判断题】Since the author needed business-oriented education, he thought about starting his own business. (T/F)
A.
正确
B.
错误
查看完整题目与答案
【单选题】DNA 聚合酶有两种方式保证复制的准确性,即选择性添加正确的核苷酸和移除错配的核苷酸。某些突变的 DNA 聚合酶 ( 突变酶 ) 比正常 DNA 聚合酶催化的精确度更高。下列有关叙述 不 正确的是 ( )
A.
．突变酶中的氨基酸序列可能发生了改变
B.
．突变酶对 DNA 复制的速度可能没有影响
C.
．突变酶增加了基因突变频率有利于进化
D.
．突变酶作用的底物是四种脱氧核糖核苷酸
查看完整题目与答案