81.
Consider the following operations:
1. Drilling
2. Blasting
3. Mucking
4. Placing steel
5. Placing concrete
The correct sequence of these operations in tunnel construction is

85.
If D is the duration, ES and EF are the earliest start and finish, LS and LF are latest start and latest finish time, then the following relation holds good

89.
Pick up the correct statement from the following with regards to C.P.M. network analysis of projects

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