检测了240例反复呼吸道感染患儿血微量元素含量。

The trace element content of 240 children with repetitive respiratory infection was detected and studied.

youdao

检测了240例反复呼吸道感染患儿血微量元素含量。

The trace element content of 240 children with repetitive respiratory infection was detected and studied.

youdao