The NC boring lathe equipped with this kind of deformable arm can bore special shaped pin hole for piston efficiently, and meanwhile meet the demand of micro meter accuracy.

装有这种新型变形镗杆的NC镗床能高效地镗削活塞异形销孔，并达到微米精度的要求。

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The NC boring machine equipped with this kind of deformable bar can bore special-shaped pin hole in piston efficiently, and meanwhile meet the demand of micro-meter accuracy.

装有这种新型变形镗杆的NC镗床能高效地镗削活塞异形销孔，并达到微米精度的要求。

youdao

Dr. Grokhovsky said the search was hampered by officials of Russia's Emergency Situations Ministry, which sealed off the area around an 8-meter-wide hole in the ice of Lake Chebarkul, near Chelyabinsk, where a chunk of the meteor was believed to have fallen.

WSJ: Russia Meteor Was Largest in More Than a Century

In the next decade, Genzel hopes the planned next generation of 30 meter-class telescopes will enable black hole astronomers to test general relativity around the event horizon itself.

FORBES: Why Our Galaxy's Supermassive Black Hole Is Hardly The Source For A 2012 Doomsday 'Killshot'

It is currently making its first pass down with a 12.5-inch diameter hole to the roof of the 50-square-meter (500-square-foot) refuge at Level 100 (100 meters above sea level).

CNN: STORY HIGHLIGHTS