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Woodruff then, Margaret Warner updates the president s push to curb gun violence as he takes his case to his hometown of chicago. Brown mark shields and Michael Gerson analyze the weeks news. Woodruff and ray suarez talks with Homeland Security secretary Janet Napolitano about combating the growing threat of cyber attacks. To the extent that some are seeking to infiltrate our network, steal that information, not have to invest in the research and development that goes into innovation, thats a really big deal. Woodruff thats all ahead on tonights newshour. Major funding for the pbs newshour has...

More than 1,000 people were injured. Paul davies of independent Television News begins our coverage. Reporter emerging from the russian sky, a giant ball of flame, a meteorite providing a spectacular show until it suddenly explodes 30 miles above the earth. The city of chelyabinsk was unlucky to be beneath the meteorites flight path and was showered with debris dropping from the sky. Thousands of windows were smashed, shocked workers evacuated their offices. This school class is about to be interrupted by the shock wave. Here the windows come crashing in, and a National Judo squad runs for cov...

Carson Hocevar will make his first NASCAR Cup Series start this weekend at Phoenix Raceway.

一、偶件技术状态的检查与判断1、柱塞副技术状态的检查与判断(1)观察法：观察磨损最严重部位的痕迹，用指甲横向划动时有明显感觉者，应换新�...