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-

1.	Metallic surveying tapes are made of _____________ which has a low co-efficient of expansion & enough strength ?
A.	Invar
B.	Hastelloy
C.	Duralumin
D.	Monel metal
Answer» B. Hastelloy

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

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