A freight forwarder will do the work of preparing shipping documents，arranging for shipping space and insurance and dealing with customs formalities，in return for a fee．( )

下列关于溶液的叙述中正确的是[    ]

A.饱和溶液降温后一定能析出晶体

B.饱和溶液升温后一定能析出晶体

C.溶液只有达到饱和后才有可能析出晶体

D.溶液不达到饱和也能析出晶体