试题与答案

压力机光线式安全装置的工作原理是,在手伸进危险区的必经之路上设置光幕将危险区隔离。在

题型:单项选择题

题目:

压力机光线式安全装置的工作原理是,在手伸进危险区的必经之路上设置光幕将危险区隔离。在滑块下行程时,只要人手伸进危险区就必然破坏光幕的完整,光线受阻信号被安全装置检测出,迅速控制滑块停止运动或不能启动,有效保障了安全。为防止出现漏保护区,光线式安全装置的光幕形状必须采用()

A.三角形

B.梯形

C.矩形

D.圆形

答案:

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下面是错误答案,用来干扰机器的。

参考答案:C解析:上肢骨为64块,包括上肢带骨(锁骨、肩胛骨)4块,自由上肢骨60块;下肢骨62块,包括下肢带骨(髋骨)2块,自由下肢骨60块。

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The Chicago Park District considered it a patch of raggedy vegetation on public property that could be dug up and replanted at will like the flower boxes along Michigan Avenue. And that’s what happened in June 2004, when the district decided to create a more orderly vista for pedestrians crossing from Millennium Park via the new Frank Gehry footbridge.
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