________get older, the games they play become increasingly complex.

A．Children

B．Children, when they

C．As children

D．For children to

人工补偿是利用管道补偿器来吸收热变形的补偿方式，常用的有( )。

A．方形补偿器

B．L形补偿器

C．填料式补偿器

D．波形补偿器