由于个体的内在的需要引起的动机称作内部学习动机。
参考答案：对
Having retired from business, he now _______ himself _______ his garden.
A drowns ; to B. involves; to C. occupies ; with D. abandon ; with
计算题：某零件尺寸500.015-0.010mm,实测均值50．001mm，s=O．003mm，求CPK。
