I am a service passport holder and have a valid B1 visa. If I am invited to attend an academic conference in the US and apply for a J1 visa, will my B1visa still be valid?

我持公务护照，并且有有效B1签证。如果应邀去美国参加学术会议，要办理J 1签证，那么我的B1签证还会有效吗？

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The paper briefly introduces the principle of sub-network connection protection and the definition of J1 byte. On the ground of that, analyzes the application of J1 byte in the SNCP.

本文主要阐述了子网连接保护（SNCP）的工作原理及J1字节的详细定义，并对J1字节在SNCP保护中的处理方法进行了具体分析。

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Based on the acoustic wave sounding of the dam foundation of a water control project, the continuous ratio of J1~J4 inter layer shear zone is infered by analyzing the acoustic velocity anomaly.

以某水利枢纽工程坝基声波探测为例 ，通过声速异常分析 ，对J1～J4 层间剪切带连续率进行了推定 ，其部分成果经开挖验证具有一定的可靠性。

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J1, which would link Broad Street and Commercial Street, is thought to be the largest single development in Jersey.

BBC: St Helier office development approved

The new WP-N1 is an underwater case that can house either the Nikon 1 J1 or new J2 in addition to the versatile 1 NIKKOR 10-30mm lens.

ENGADGET: Nikon 1 J2 mirrorless camera: minor control tweaks, $549, ships in September

The 11-27.5mm lens will be offered in Black and White, and will be compatible with the Nikon J2 as well as the Nikon 1 V1 and Nikon 1 J1.

ENGADGET: Nikon 1 J2 mirrorless camera: minor control tweaks, $549, ships in September