下列化合物中具有强烈天蓝色荧光的是()
A.七叶内脂
B.大黄素
C.麻黄碱
D.甘草酸
E.大豆皂苷
参考答案:A
"He graduated from English Department, Beijing University. " illustrates the fact that English differs from Chinese in ().
A. branching sentence patterns
B. paratactic relations
C. word order
D. number and case
机务、电务处应加强LKJ系统工作的领导,()召开一次由运输、机务、电务、工务、总工室、安监室、铁通公司等相关部门参加的工作协调会。