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_____ the compression ratio, _____ the proportion of the heat energy of the combustion tur
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From the passage we gather that the two speakers are in_________.A．the WestB．the EastC．the
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The police asked the children______ cross the street______the traffic lights turned green.
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Compared with public television, commercial television______.A．broadcast programs which do
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The respondent would advise the new channel to______.A．train broadcasters with higher stan
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It was not until 1920 ______ regular broadcast began.A、whileB、whichC、thatD、since
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The ratio of the work done by the machine______________the work done on it is called the
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