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举一反三
【单选题】Which of the following is example of telecommuting as described in the passage?
A.
A scientist in a laboratory developing plans for a space station.
B.
A technical writer sending via computer documents created at home.
C.
A computer technician repairing an office computer network.
D.
A teacher directing computer--assisted learning in a private school.
【简答题】纯铁分别按图1所示不同冷却曲线冷却,其中,沿曲线( 1 )冷却,过冷度最小;沿曲线( 2 )冷却,结晶速度最慢;沿曲线( 3 )冷却,晶粒最细小。
【单选题】6) Venusian scientists discovered several hazards_______.
A.
during their long years of study of the planet Earth.
B.
when they studied the information sent back by the satellite.
C.
shortly after the press conference held at an institute.
D.
long before working out the flying saucer program.
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