关于污泥指数(SVI),正确的叙述是()
A、SVI过低,活性污泥中有机物较多
B、SVI过高时,污泥细小紧密
C、SVI过低,活性污泥缺乏活性
D、SVI越小越好
参考答案:C
在板框过滤机上,只有过滤板才装有滤液出口阀。
You will have an idea of what a hard life the working people________at that time after you read the
book.[ ]
A. enjoyed
B. shared
C. managed
D. lived