secondary source
短语词组
- the secondary water source 第二水源
- secondary noise source 次级声源
- secondary radiation source 二次辐射源
- secondary standard source 次级标准源
- the secondary fire source 再生火源
- secondary sound source 次级声源
- aviation secondary electric source 航空二次电源
- secondary electric source 二次
- secondary nitrogen source 二次氮源 返回 secondary source