目的 将我国职业卫生标准GBZ 2.1中规定的与ACGIH于2013年发布的化学有害因素职业接触限值(OELs)数量、水平、制定和管理过程等方......

1. Turn boring stools into fun furniture with a little paint.　　2. If the school permits it， paint your ceiling.　　You ......

Various bio-inspired dry adhesive materials have been investigated.In this work,lithography and silicon deep etching met......