在替换介质功能中，内容信息和保存描述信息(PDI)绝对不能改变。
Within the Replace Media function the Content Information and Preservation Description Information (PDI) must not be altered.
闸板底部做成刀形斜面具有切断介质功能，而且闸板关闭时通过阀体上的锲块紧靠闸板斜切面使得闸板紧紧贴靠阀座密封面，从而起到了密封效果。
The bottom of the disc is made of knife-shaped gate with a cut off function of the medium. When gate is closed, oblique plane of gate valve encounters wedge block of gate to achieve sealing effect.
如果功能性的测试工具没有安装，那么在您安装Firefox 2.0之后，您还需要使用安装介质的硬盘1中的launchpad . sh脚本，来安装Rational Functional Tester。
If the functional testing tool is not installed, after you install Firefox 2.0, install Rational functional Tester by running the launchpad.sh script on disk 1 of the installation media.
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