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[主观题]
A.l(a)bB.t(a)bleC.m(a)thD.att(a)ck
A.l(a)b
B.t(a)ble
C.m(a)th
D.att(a)ck
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A.l(a)b
B.t(a)ble
C.m(a)th
D.att(a)ck
A.l' ve read it.
B.It' s well-wri tten.
C.It was written by my uncle.
构成人体蛋白质的氨基酸属于下列哪种氨基酸?()
A.L一α一氨基酸
B.L—β一氨基酸
C.D—α一氨基酸
D.D一β一氨基酸
慢性支气管炎的缓解期,时间应是
A.l个月以内
B.1个月以上
C.2个月以内
D.2个月以上
E.3个月以内