engineering recuitment WBPSC JE Civil Mock Test 2022 Environmental Engineering Quality and Characteristics of Sewage

अवस्थापन ठोस को किसके द्वारा मापा जाता है?

1
इम्हॉफ शंकु 
2
ग्रिट चैम्बर
3
pH मीटर
4
टर्बिडिटी मीटर
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