The recent conference on the effective use of the seas and oceans was another attempt resolving major differences among countries with conflicting interests.

A．resolve

B．resolves

C．to resolve

D．being resolved

检识鞣质常用的试剂是( )

A．明胶
B．AlCl₃
C．ZrOCl₂/枸橼酸
D．Ba(OH)₂
E．Mg-HCl