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【单选题】
血小板减少导致皮肤出现自发性出血斑点的主要原因是A.
血小板不能聚集成团
B.
血小板不能释放足够的血管活性物质
C.
不能修复和保持血管内皮完整性
D.
血凝块回缩障碍
E.
血小板粘附减少
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反馈参考答案：
举一反三
【单选题】Which of the following processes allow(s) the transfer of bacterial DNA between different individual cells?
A.
transformation
B.
conjugation
C.
generalized transduction
D.
all of the above
E.
none of the above
【简答题】品类创新是从竞争源头创造竞争，创造对持的局面。()
【简答题】conjugation between two or more chromophores tends to cause shifts in absorption maxima to ________________________.
【单选题】Which one of the following is the most accurate description of the structural differences between gram-positive bacteria and gram-negative bacteria ?
A.
gram-positive bacteria have a thick peptidoglycan layer, whereas gram-negative bacteria have a thin layer
B.
gram-positive bacteria have an outer lipid-rich membrane, whereas gram-negative bacteria do not
C.
gram-positive bacteria form a sex pilus that mediates conjugation ,whereas gram-negative bacteria do not
D.
gram-positive bacteria have plasmids, whereas gram-negative bacteria do not
E.
gram-positive bacteria have capsules, whereas gram-negative bacteria do not
【单选题】The transfer of a naked fragment of DNA between bacteria is called
A.
conjugation
B.
transformation
C.
transduction
【单选题】Which one of the following is the most accurate description of the structural differences between gram-positive bacteria and gram-negative bacteria?
A.
Gram-positive bacteria have a thick peptidoglycan layer whereas gramnegative bacteria have a thin layer.
B.
Gram-positive bacteria have an outer lipid-rich membrane whereas gramnegative bacteria do not.
C.
Gram-positive bacteria form a sex pilus that mediates conjugation whereas gram-negative bacteria do not.
D.
Gram-positive bacteria have plasmids whereas gram-negative bacteria do not.
E.
Gram-positive bacteria have capsules whereas gram-negative bacteria do not.
【简答题】填写8位数商品编码: 汽车用调频条幅立体声收放音组合机( )
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