B. FindByPrimaryKey: in this method, the objective is to get back a single OperatingSystem instance from the CIMOM using the primary keys of an entity bean.
FindByPrimaryKey：在这个方法中，其目标是使用实体bean的主键从CIMOM中返回单个OperatingSystem实例。
Objective to know the instance of arsenic pollution and endemic arsenism and the degree of damage in the south of Shannxi province, to affirm whether there was coal burning-born arsenism areas.
目的查清陕南燃煤污染区的环境砷污染及地方性砷中毒的发病情况和危害程度，确认该区域是否为燃煤型地方性砷中毒病区。
Objective to know the instance of arsenic pollution and endemic arsenism and the degree of damage in the south of Shannxi province, to affirm whether there was coal burning-born arsenism areas.
目的查清陕南燃煤污染区的环境砷污染及地方性砷中毒的发病情况和危害程度，确认该区域是否为燃煤型地方性砷中毒病区。
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