railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Biology Human body

તંદુરસ્ત માનવીની લાળનું pH મોટે ભાગે ______________ થી રેન્જ ધરાવે છે.

1

7.7 થી 9.2

2

4.1 થી 5.2

3

6.2 થી 7.6

4

5.2 થી 6.1

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