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A) write the name of any two instrument based on atmoshpheric pressure.
B)Which chemical is used to increase the setting period of cement?
C)What are the near point and far point of normal eye?​

Sagot :

Answer:

Explanation:(a)Mercury Barometer and Aneroid Barometer

(b)Gypsum

(c)Near point of human eye is 25 cm and the far point is infinity.

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