中国营养学会推荐，我国成年居民摄入蛋白质应占能量百分比的范围是 A．5%～10% B

The students in Class Two played basketball against Class One yesterday, _______? [ ]

A. did they

B. didn't they

C. weren't they

一盯人四区域

黄酮类化合物的UV光谱中产生吸收带Ⅱ的基本结构是

A．乙酰基
B．苯甲酰基
C．咖啡酰基
D．桂皮酰基
E．阿魏酰基

双分型面注射模设计注意事项有哪些？