题目内容

导线点的横向误差主要是由水平角的观测误差引起的。()

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望远镜对光的程序是:物镜对光,回镜对光,检查交消除视差。()

It is vital that scientists should perceive the danger now before it is too late.

The______(discover) of gold on their land made the people rapidly rich.

边坡样板可分活动式和固定式两种。()

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