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【多选题】
PRPP(磷酸核糖焦磷酸)参与的反应有A.
IMP从头合成
B.
IMP补救合成
C.
GMP补救合成
D.
UMP从头合成
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反馈参考答案：
举一反三
【单选题】根据《一、二、三类动物疫病病种名录》（农业部第1125号公告）的规定，下列属于一类动物疫病的病种是（）。
A.
鸡球虫病
B.
低致病性禽流感
C.
鸡新城疫
D.
禽白血病
【简答题】A.Two years． B.Four years． C.Three years． D.Two to four years．
【简答题】A．Twenty years. B．Four years. C．Twelve years. D．Twenty-four years.
【简答题】University students must __________themselves; otherwise, they will never complete their studies and get a bachelor's degree within four years.
【简答题】University students must be strict _______ themselves; otherwise, they will never complete their studies and get a bachelor's degree within four years.
【单选题】My brother has a ______ daughter. She’s kind and lovely.
A.
four-years-old
B.
four-year-old
C.
fourth-year-old
D.
four-year-olds
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