The boy ________ on the playground _______ to me that he _______ my coat on the grass.

A．lay, lying, had laid

B．lied, laying , had laid

C．laid, lay, had lain

D．lay, lied, has laid

画分解式轴侧装配时，应先画出装配体中（）的轴测图。

A、单个零件

B、主体零件

C、装配方向

D、坐标轴