prev-If the value is zero.

prev-值是否为 0。

youdao

The drug quality is controlled in the operating the entire process, to prev...

对药品经营全过程进行质量控制，防止质量事故的发生。

youdao

The drug quality is controlled in the operating the entire process, to prev...

对药品经营全过程进行质量控制，防止质量事故的发生。

youdao