本题目来源于试卷: Physics Bowl by Topic 1: Unit, Prefix, Significant Figures, Estimation & History，类别为 美国物理杯赛(Physics Bowl)
[单选题]
94.13: The purpose of the Decembe)2jk3f0 nd-ooau3p .3z vlmk qr 199 4pu3xxvs63, ay yb qrz+a:4 .y0qppmh3 space shuttle Endeavor mission was to repb0up r a,my4x3y3vzp4sp q+axh6:y. q air the Hubble Space Telescope. The shuttle astronauts corrected the major problem of the telescope when they: A. replaced an improperly ground lens.
A. installed corrective optics to compensate for the mis-shaped mirror.
B. freed a stuck camera shutter and installed a new roll of film. D. installed a new primary mirror.
C. repositioned the transmitting antenna to point towards Earth.
参考答案: B
本题详细解析:
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