短跑运动员肌肉中,()酶活性最高。
A、乳酸脱氢酶
B、琥珀酸脱氢酸
C、苹果酸脱氢酶
参考答案:A
甾体皂苷元的结构特点是()
A.由27个碳原子组成
B.有螺缩酮结构
C.C-3位多有OH取代
D.B环均为反
The professor recommends that we ____ the experiment until it is carefully designed.[ ]
A don't start
B. not start
C. will not start
D. would not start