—           ？

—Two hundred yuan.

A．How much is this apple

B．How is your schoolbag

C．How much is that recorder

D．How do you like this recorder

由于溶质原子进入溶剂晶格的间隙或结点，使晶格发生畸变，使固溶体硬度和强度升高，这种现象称为（）。