To master the addition principle and apply the addition principle & the multiplication principle to practical problems 掌握加法原理，能用加法原理与乘法原理解决实际问题。
2.
The addition principle of extrapolated doses and iso - effect principle of isoextrapolated doses were also presented 引用了分割照射和延续照射的外推剂量概念，提出了外推剂量可加原理和等外推剂量等效应原理。
