The penetration value of bitumen sample tested at 25 C is 80. When this sample is heated to 60 C and tested again, the needle of the penetration test apparatus penetrates the bitumen sample by d mm. The value of d CANNOT be less than _____ mm.

The penetration value of bitumen sample tested at 25 C is 80. When thi

1.	The penetration value of bitumen sample tested at 25 C is 80. When this sample is heated to 60 C and tested again, the needle of the penetration test apparatus penetrates the bitumen sample by d mm. The value of d CANNOT be less than _____ mm.
A.	7
B.	6
C.	5
D.	8
Answer» E.

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The penetration value of bitumen sample tested at 25 C is 80. When this sample is heated to 60 C and tested again, the needle of the penetration test apparatus penetrates the bitumen sample by d mm. The value of d CANNOT be less than _____ mm.

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