下面哪种药物具有手性碳原子,临床上用(+)异构体()
A.丙磺舒
B.吡罗昔康
C.萘普生
D.美洛昔康
E.双氯芬酸钠
参考答案:C
货物运输保险单据按保险单的形式划分,主要有()。
A.流动保险单
B.保险单
C.保险凭证
D.联合凭证
E.暂保单
For a vessel inclined by the wind, multiplying the buoyant force by the horizontal distance between the lines of action of the buoyant and gravity forces gives the().
A.righting moment
B.vertical moment
C.longitudinal moment
D.transverse moment