c**i
发帖数: 6973 | 1 That is the title of a report yesterday in Wall Street Journal.
A quote:
"Pratt [& Whitney of United Technologies, an American company] has spent
roughly $1 billion over the last 20 years to develop its new engine, called
the geared turbofan. It includes a gearbox that enables the fan and the
internal engine parts to spin at different speeds. Pratt says this allows it
to run more efficiently, burning about 12% less fuel and making less noise
than today's engines. In recent months, both Mitsubish |
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