This is achieved by applying and removing the J2EE context information on and off the thread when the application logic begins and ends.
当应用程序逻辑开始和终止时，这可以通过应用和删除线程内外的J2EE上下文信息来完成。
2
Applying backflushing helps maintain the GC and the MS source by removing later eluting compounds from the column before reaching the MS, and prior to the next sample injection.
These test methods cover procedures for assessing the adhesion of coating films to metallic substrates by applying and removing pressure-sensitive tape over cuts made in the film.