Materials for railway vehicles; elastomers, functional group: permanent door and window seals, specification group.

铁道机车用的材料；弹性体，功能组；永久性密封的门、窗型材，要求类别。

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It's because the JPA specification imposes a group-like behavior on the managed instances of a persistence context.

这是因为JPA规范对持久性上下文的管理实例施加的了一个类似组的行为。

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The current power carrying capacity of USB 3.0 connectors is limited today but by the Spring of 2012 a USB IF (USB trade group)a specification will be released that allows up to 100 W of power through a USB 3.0 cable.

FORBES: Making Connections at the 2012 CES

In early 2012 the group expects to release a new prototype specification that will increase the power that USB cables can transport up to 100 W (20 V and 5 A).

FORBES: New Technology and Investment Opportunities at the 2011 Intel Developers Forum

In July 1999 members of the Open eBook group will be voting on the final draft of the Open eBook 1.0 specification.

CNN: Microsoft pushes electronic book standard