单项选择题 TPM有几大支柱（）

未知题型 More than a million persons live within 2,000 miles of the North Pole in an area that includes most of Alaska, Siberia, and Scandinavia—a region rich 40 forest and mining industries. Apart from a handful weather stations, within the same distance of the South Pole is not a single tree, industry or settlement.

单项选择题 认证中班前会评价属于（）