污染源
参考答案:
通常指向环境排放或释放有害物质或对环境产生有害影响的场所、设备和装置。
With time changing so fast, to keep _____ with time, anyone should be a lifelong learner, or he will fall behind within years.
A.pace
B.stage
C.fare
D.Attitude
混床底部进压缩空气装置的作用是再生后,混合阴阳树脂使用。