2. 外语
  3. Laser-dopple radar ______. Laser-dopple radar is especially valuable in space missions because it ______.

Laser-dopple radar ______. Laser-dopple radar is especially valuable in space missions because it ______.

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问题 Laser-dopple radar ______.
Laser-dopple radar is especially valuable in space missions because it ______.
选项 A、is one thousand times more precise than microwave radar
B、provides precise measures of the velocity of space vehicles
C、is a new system of radar
D、can measure the movement of a spaceship less accurately than a microwave radar
答案B
解析 ．laser-dopple radar，can measure with absolute precision．．．such fine measures of velocity are of prime importance．
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