For several minutes, the flight proceeded smoothly. Orville circled the field at an altitude of roughly 100 to 150 feet. Spectators below watched as the Flyer completed three laps. Then, halfway through the fourth circuit, one of the wooden propellers broke and the plane began to lose thrust. The unbalanced propeller began to vibrate violently. The shaking transmitted through the drive chains and frame of the aircraft caused the split propeller to hit a supporting guy wire, causing it to snap. The wire tore out of its fastening and shattered the propeller, while the rudder swivelled to the horizontal and sent the Flyer into a nose dive.
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现在的趋势不是“关掉”煤电，而是让它“少干活、多备勤”。煤电的利用小时数在降低，这其实就是一种退出方式——发电少了，排碳就少了。但为了让这些煤电厂在关键时刻（如无风无光的寒冬或酷暑）能“随叫随到”，就得给它一个能覆盖固定成本的“候场费”。这就是近期出台的“容量电价补偿机制”。
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