在定义行为时，如果希望当鼠标移入页面元素上方时触发事件，则该事件为（）事件。
参考答案：onMouseOver
各温度表将燃烧炉的局部温度准确的反馈到计算机，为燃烧炉做下一步工作提供依据。
Why does the Earth show almost no signs of having been hit by numerous meteors in the past
A．Humans have built over most of the craters.
B．Most meteors fell into the ocean and not on land.
C．The Earth's magnetic field repelled most meteors.
D．The Earth's natural geologic activity has eliminated most traces.
