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【单选题】
车削加工时,减小( )可以减小工件的表面粗糙度值。A.
主偏角
B.
副偏角
C.
刀尖角
D.
刃倾角
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举一反三
【单选题】若某猪群爆发仔猪副伤寒,对患病猪应采取( )措施
A.
隔离并注射猪仔猪副伤寒疫苗
B.
隔离并注射干扰素等抗病毒药物
C.
隔离并注射仔猪副伤寒高免血清
D.
隔离并注射有效的抗生素，并对症治疗
【简答题】仔猪副伤寒是由()属的细菌引起的仔猪传染病。
【简答题】仔猪副伤寒也称为（）。A. 猪沙门氏菌病
【单选题】大肠杆菌引起猪的传染病有( )
A.
仔猪白痢、仔猪副伤寒、仔猪红痢
B.
仔猪黄痢、仔猪红痢、猪痢疾
C.
仔猪水肿病、仔猪白痢、仔猪副伤寒
D.
仔猪白痢、仔猪水肿病、仔猪黄痢
E.
仔猪红痢、仔猪副伤寒、仔猪口蹄疫
【简答题】There was a little boy 26 his grandparents on their farm.He was given a slingshot（弹弓）to play with,out in the woods.He 27 in the woods,but he could never hit the target.Getting a little 28 ,he headed b...
【简答题】D I shall never forget the night, a few years ago, when Marion J. Douglas was a student in one of my -education classes. He told us how tragedy had struck at his home, not once, but twice. The fi...
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