engineering recuitment PPSC JE Civil Mock Test 2022 Environmental Engineering Quality of Water

पेयजल में जीवाणु की कुल संख्या _____ से अधिक नहीं होनी चाहिए।

1
10 प्रति cc
2
100 प्रति cc
3
10000 प्रति cc
4
1000 प्रति cc
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