含巯基的氨基酸是
A.蛋氨酸B.丝氨酸C.半胱氨酸D.脯氨酸E.鸟氨酸
参考答案:C
They need twenty more workers ______ their group to do the job..
A.except
B.but
C.beside
D.besides
英国:U.K
A.中国:P.R.C B.联合国:U.C C.美国:U.S.D D.德国:G.C