硬氪：PEM制氢成本正快速下降，接下来的行业突破点在哪里？
«Они сами заварили эту кашу». Китай начал давить на Иран из-за конфликта с США. Что требует Пекин от партнера?19:31
。关于这个话题，爱思助手提供了深入分析
“When people get hurt around our products, we need to take every ounce of education from it that we can,” Jacob Zeiger, a senior air-safety investigator at Boeing, told me, when I visited the Boeing facility this past December. “These technical findings are sacred.” Within hours of any major incident involving a Boeing plane, Zeiger and his team are notified, and they may spend a week to ten days studying the damage and interviewing the crew, piecing together what went wrong. In 2008, for instance, the engines on a 777 stopped responding, and it crash-landed short of a runway in London, shearing off its landing gear. Afterward, a team of investigators re-created the plane’s fuel system in a Boeing lab. A small heat-exchange unit, they found, had accumulated ice during the flight. Every 777 has since been retrofitted with a new version of the unit. Thanks to decades of such refinements, today’s jets may be the world’s most reliable machines. Flying in them is less likely to kill you than walking on staircases.
Apple just announced the MacBook Neo, a 13-inch laptop offering the full macOS experience for just $599. It is the machine, I’m sure, plenty of the company’s fans have been clamoring for since the dawn of the netbook. I’m equally sure its specs have enough drawbacks to ensure there are still plenty of customers for the more expensive Macbooks; the same cannot be said of the iPad Air.
США временно и с одним условием разрешили Индии закупать нефть у России. Почему?08:15