To determine the leading causes of fatal injury for urban South African children aged 0-14 years, the distribution of those causes and the current potential for safety improvements.
确定南非城市0到14岁儿童受到致命伤害的主要原因，这些原因的分布以及目前加强安全的可能性。
Changes in specular reflectivity, weight loss, surface topograph and potential with time and current-potential curves during chemical polishing were determined.
测定了化学抛光过程中紫铜的表面光反射率、失重、表面形貌和电位随时间的变化以及抛光过程的电流-电位曲线。
Changes in specular reflectivity, weight loss, surface topograph and potential with time and current-potential curves during chemical polishing were determined.
测定了化学抛光过程中紫铜的表面光反射率、失重、表面形貌和电位随时间的变化以及抛光过程的电流-电位曲线。
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