10个腺苷和100个磷酸最多能组成的ATP数目为[ ]
A.10个
B.20个
C.30个
D.40个
答案:A
I have _____book. It's _____ English book. [ ]
A. a, a
B. a, an
C. an, a
类风湿关节炎最常累及的关节()
A.掌指关节和近端指间关节
B.肩肘关节
C.踝关节
D.髋关节
E.中轴关节