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单项选择题多肽链中主链骨架(N端至C端)的组成排列正确的是 ( 难度:2)

A、-C CONHC CONH-

B、-C CONHCONHC

C、-CONHC C NOCH-

D、-C NOCHC OCNH-

E、-C NHCO NHCO-

  • A
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