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【单选题】
四环素阻断原核生物多肽链合成的机制是 ( )A.
与mRNA竞争核糖体的结合部位
B.
阻断mRNA的合成
C.
从mRNA-tRNA复合物中释放多肽链
D.
与核糖体小亚基结合
E.
阻止tRNA与氨基酸结合
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【简答题】No ( )is used at the end of a title .A. period B.question mark C.exclamation mark D.comma B. question mark C.exclamation mark D.comma C. exclamation mark D.comma D. comma
【单选题】No period is used at the end of a title, but use_____ if the title is ______.
A.
semicolon... a negation
B.
a colon... a question
C.
a comma... a statement
D.
a question mark... a question
【单选题】No period is used at the end of a title, but useif the title is .
A.
a question mark…a question
B.
a comma…a statement
C.
semicolon…a negation
D.
a colon…a question
【简答题】引导接车时，列车以不超过（）km/h（动车组列车为不超过（）km/h）速度进站，并做好随时停车的准备。
【简答题】Passage 1 No author in American literature is better known or more loved than Samuel Langhorne Clemens. Born in Missouri in 1835, he grew up on the banks of the Mississippi River and used the pen name...
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