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【单选题】
第二节（共6小题，每小题1分，满分6分） 听下面6段对话。每段对话后有一个小题， 从题中所给的A、B、C三个选项中选出最佳选项。听完每段对话后，你有10秒钟的时间来回答有题和阅读下一小题。每段对话仅读一遍。 7.At what time does the shop open on Wednesday？A.
10 a.m
B.
9 a.m.
C.
8 a.m.
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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。()
【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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