灰色文献最常见的型式为摘要(55%)及未出版的资料(30%)。

The most common types of grey literature were abstracts (55%) and unpublished data (30%).

youdao

灰色文献最常见的型式为摘要(55%)及未出版的资料(30%)。

The most common types of grey literature were abstracts (55%) and unpublished data (30%).

youdao