若变量已正确定义,下列正确的程序段是( )。A.while(ch=getchar()=='\NN')putchar(ch);B.while((ch=getchar())=='\n')putchar(ch);C.while((ch=getchar())!='\N')putchar(ch);D.while((ch=getchar())!='\n')putchar(ch);
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嘌呤碱基的C8来自于A.N-CH-NH-FHB.N-CH-FHC.N-CHO-FHD.N,N-CH-FHE.N,N=CH-FH
胸腺嘧啶的甲基来自A.N-CH=NHFH B.N-CHOFH C.N-CHFH D.N,N=CH-FH E.N,N-CH-FH
嘌呤碱基的C8来自于A.N-CHO-FH B.N,N-CH-FH C.N,N=CH-FH D.N5-CH-NH-FH E.N-CH-FH
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