题目内容

Which method of deflection wouldn't work well ona rotating asteroid?

A. exploding a nuclear bomb nearby
B. hitting it with a spacecraft
C. pulling it using gravity
D. landing on it and pushing it

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What might change the course of Apophis so that it hitsthe Earth within the next 30 years

A. Its own gravity
B. a spacecraft's gravity
C. the Earth's gravity
D. a comet's gravity

包含齿轮所有齿槽底的圆称为。

在齿顶圆和齿根圆之间，规定一直径为d的圆，作为计算齿轮各部分尺寸的基准，称为。

在分度圆上，齿距计算的公式为。