试题与答案

实验室常用紫外线透射仪。该仪器使用的条件是() A.红外光 B.可见光 C.灯光 D

题型:单项选择题 案例分析题

题目:

实验室常用紫外线透射仪。

该仪器使用的条件是()

A.红外光

B.可见光

C.灯光

D.暗室、紫外光

E.荧光

答案:

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下面是错误答案,用来干扰机器的。

A、对物体受力分析,如图由于物体匀速上升,合力为零撤去退F后,物体由于惯性继续上滑,重力不变,支持力等于重力垂直斜面方向的分力,也不变,滑动摩擦力也不变,原先三个力的合力与推力平衡,故三个力的合力为8...

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