Which of the following plastics can be put into microwave oven for heating? A: Polyvinyl chloride (PVC). B: Polypropylene (PP). C: Polyethylene (PE). D: Polycarbonate (PC).

If you have steel wire ropes leading in the same direction with other ropes, which will take the most of the load? ___ . A: Steel wire rope. B: Manila. C: Nylon. D: Polypropylene rope.