Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) People Development & Environment Environmental Issues Pollution

अपशिष्ट जल के प्राथमिक उपचार में _______ को हटाना शामिल है।

1
ठोस
2
कोलॉइड
3
जैविक जल
4
सूक्ष्मजीव
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