Metallic surveying tapes are made of __________ which has a low co-efficient of expansion & enough strength.

Metallic surveying tapes are made of __________ which has a low co-eff

1.	Metallic surveying tapes are made of __________ which has a low co-efficient of expansion & enough strength.
A.	invar
B.	hastealloy
C.	duralumin
D.	monel metal
Answer» B. hastealloy

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Metallic surveying tapes are made of __________ which has a low co-efficient of expansion & enough strength.

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