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The authors attribute each tower’s collapse to three separate but related "loading events". 61) {{U}}The first event was a Boeing aircraft hitting the building, cutting through the exterior structure and creating a fireball that immediately consumed some of the estimated 10.000 gallons (38 kiloliters) of jet fuel{{/U}}. The high-rises structural systems were sufficiently redundant. However, that this major damage by itself did not cause the collapse. According to the report, "most of the load supported by the failed columns is believed to have been transferred to adjacent perimeter columns through Vierendeel behavior of the exterior wall frame".
62) {{U}}The second event was the continuing tire. fed both by the remaining jet fuel and the office contents of furniture and paper{{/U}}. 63) {{U}}This fire heated and weakened the structural systems. adding stress to the damaged structure{{/U}}. Meanwhile, the sprinklers were not operating as desig

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[简答题]

The authors attribute each tower’s collapse to three separate but related "loading events". 61) {{U}}The first event was a Boeing aircraft hitting the building, cutting through the exterior structure and creating a fireball that immediately consumed some of the estimated 10.000 gallons (38 kiloliters) of jet fuel{{/U}}. The high-rises structural systems were sufficiently redundant. However, that this major damage by itself did not cause the collapse. According to the report, "most of the load supported by the failed columns is believed to have been transferred to adjacent perimeter columns through Vierendeel behavior of the exterior wall frame".
62) {{U}}The second event was the continuing tire. fed both by the remaining jet fuel and the office contents of furniture and paper{{/U}}. 63) {{U}}This fire heated and weakened the structural systems. adding stress to the damaged structure{{/U}}. Meanwhile, the sprinklers were not operating as desig

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[单项选择]靶心率(THR)是指
A. 与运动中绝不能超过的最高强度相当的心率
B. 与运动应该达到的适宜强度相当的心率
C. 亚极量负荷时的心率
D. 运动终止后5min时的心率
E. 以上都不对

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The Economist recognises these talented people through its annual Innovation Awards, presented in six fields: bioscience, computing and communications, energy and environment, business-process innovation, consumer products and a flexible "no boundaries" category. The awards were presented at a ceremony in London on November 9th by John Micklethwait, The Economist’s editor-in-chief.
And the winners were:
Bioscience:
Marvin Caruthers, professor of chemistry and biochemistry at the University of Colorado at Boulder, for the development of automated DNA synthesis--the ability to "print out" arbitrary strands of genetic material.
(41) Computing and communications:
a creative individual who dreams up new ideas of computing and communi6ations and turn them into reality.
(42) Energy and environment:
a creative individual who dreams up new ideas of energy and environment and turn them into real

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