PHA通常用于项目研发的前期，在此期间只有极少的关于设计说明或操作规程的信息。

PHA is most commonly used early in the development of a project when there is little information on design details or operating procedures; thus, it will often be a precursor to further studies.

youdao

PHA通常用于项目研发的前期，在此期间只有极少的关于设计说明或操作规程的信息。

PHA is most commonly used early in the development of a project when there is little information on design details or operating procedures; thus, it will often be a precursor to further studies.

youdao