Maximal Permissible Exposure Time最大允许的曝光时间 Master of Professional Education and Training职业教育与培训的主人 Measurement/Performance Evaluation Tool测量/绩效评估工具 Metallized Polyethylene Terephthalate金属化聚乙烯回顾 Magellan Petroleum Corporation麦哲伦石油公司