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 根据第二段：...laser-dopple radar, can measure with absolute precision...such fine measures of velocity are of prime importance.
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