A maritime lien may be placed against().
A. any assets that a ship's owner may have
B. a vessel,cargo,or freight
C. objects that are fixed and immovable,such as wharves
D. the vessel only
社会调查研究的最基本的对象有个人、初级社会群体() 、阶级和阶层、民族、社区、社会行为、() 等。
称取头孢氨苄0.1053g,加水配成50ml,稀释100倍后按照分光光度法于262nm波长处测得吸光度为0.455,其吸收系数(E1%1cm)是()
A. 207
B. 216
C. 316
D. 715