Answer :
In order to test the turning machine bed for level you need b. Bridge pieces and c. Spirit level.
To test the turning machine bed for level, you would typically need bridge pieces and a spirit level. The bridge pieces are used to create a stable and even surface across the bed of the turning machine. The spirit level is a tool used to measure the horizontal levelness of the bed. By placing the spirit level on the bridge pieces, you can check if the bed is level or if any adjustments need to be made.
The other options, a dial indicator and none, are not essential for testing the turning machine bed for level. A dial indicator is a precision measurement tool used for measuring small linear distances, and it may not be necessary for this specific task. The option "none" implies that no tools or equipment are needed, which is not accurate in this case as bridge pieces and a spirit level are typically required. Therefore, options b and c (bridge pieces and spirit level) are the most appropriate choices for testing the turning machine bed for level.
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