At what depth does an employer need to use a protection system to ensure the safety of workers in a trench or excavation?

Two technicians are discussing the common u-joint. technician a says its input and output speeds should be equal. technician b says that it normally has two yokes. which technician is correct?

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How often does colleges update the cost of attendance on their website? . a)every two years b) every four years c) every year d) every semester