21.
How far beyond the road should the trench extend for a buried road crossing?
A.
1 foot
B.
1 1/2 feet
C.
2 feet
D.
2 1/2 feet
22.
What type of tape is used in the arctic?
A
TL-300
B.
TL-400
C.
TL-500
D.
TL-600/U
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