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(4分).楼内电梯的安装不能倾斜,利用你所学物理知识想出两个办法,帮助工人将电梯...

(4分).楼内电梯的安装不能倾斜,利用你所学物理知识想出两个办法,帮助工人将电梯安排得又正又直。简述设计方法和原理

   (1)

 

 

   (2)

 

 

 

(1)(2分)利用重垂线检查电梯安装是否竖直。   (2)(2分)利用光的直线传播原理,用一个激光手电筒检查电梯安装是否垂直。 【解析】
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