题目内容
(请给出正确答案)
[主观题]
The sewage treatment usually consists of() .
The sewage treatment usually consists of() .
A. the bio-filter tank
B. the sterilization compartment
C. both A and B
D. either A or B
提问人:网友曾深鑫
发布时间:2022-01-07
A. the bio-filter tank
B. the sterilization compartment
C. both A and B
D. either A or B
A.对
B.错
A cast iron
B steel
C aluminum-alloy
D tin-alloy
B. carry away contaminants and debris
C. prevent corrosion and seal for gases
D. all of the above
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