题目内容

以下不宜作为陆标定位时物标的是：________ 。 Which of the following objects is not suitable for position fixing by landmarks？

A. 灯塔 Lighthouse
B. 孤立的小岛 Isolated island
C. 平坦的海滩 Flat beach
D. 显著的山峰 Significant peak

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在全球任意位置的用户在任何时候至少能同时观测到仰角大于5°的 ____ 颗卫星。At least_satellites with an elevation greater than 5 degrees can be observed at any time by users at any position in the world.

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