试题与答案

矫形器

题型:名词解释

题目:

矫形器

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B解析:本题主要考查观察力是漫画、解释历史现象的能力。切入点是《近代物理学的成就》。观察图片,从“苹果”“月亮”“星星”等,可知是牛顿发现万有引力定律的故事,故选B项。考点:近代科学技术&#8...

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题型:单项选择题

How should you signal the crane operator to use the main hoist?().

A.Use one hand to give any miotion signal , and place the other hand motionless in front of the hand giving the motion signal

B.Extend arm with the thumb pointing up , and flex the fingers in and out for as long as the load movement is desired

C.First tap your elbow with one hand , and then proceed to use regular signals

D.First tap the top of your head with your first , and then proceed to use regular signals

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