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28 March, 09:22

Name two levels of economic activities and explain the two levels that you choose.

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  1. 28 March, 09:50
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    This subpart applies to all open excavations made in the earth's surface ... excavating the sides of an excavation to form one or a series of horizontal levels or steps ... " Faces" or "sides " means the vertical or inclined earth surfaces formed as a ... method of protecting employees from cave-ins by excavating to form sides
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