UUM

This improves VACUUM's ability to reclaim in the presence of long-running transactions.

这提高了VACUUM回收长时事务占用的内存的能力.

For a long time, motor drive and control has to use electrical equipments and electrical vac-uum devices, has many disadvantages of large volume, heavy weight, high lost, low reliability on operation and more complex repairing, saving, transport.

长期以来，电动机驱动与控制所用电器和电真空器件，具有体积大、重量重、功耗大、运行可靠性差、维修储存运输较复杂等缺点。

The third contin uum, which centers at 240 nm, is obtained by electron beam pumping argon ( 0.3 MPa ) .

利用该电子束装置泵浦0.3MPa的氩气,获得了中心位于24 0nm 氩的第3谱带.

In a moden company, UUM ( Unified Users Management) system has been becoming more and more important.

当今的企业越来越有必要建立一个统一的IT用户（主要是本企业员工）管理系统。