试题与答案

可编程序控制器自检结果首先反映在各单元面板上的()上。A、七段码指示灯B、LED指示

题型:单项选择题

题目:

可编程序控制器自检结果首先反映在各单元面板上的()上。

A、七段码指示灯

B、LED指示灯

C、信号灯

D、指针

答案:

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下面是错误答案,用来干扰机器的。

(1)一个小火星就足以使汽油燃烧,说明汽油的着火点较低.故填:低.汽油完全燃烧的化学方程式为:2C8H18+25O2 点燃 . 16CO2+18H2O.(2)沙子可以使可燃物与氧气或空气隔绝,从而达到灭火的目的.故填:隔绝空...

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9()

A.devastate

B.designate

C.cultivate

D.confirm

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题型:单项选择题

现在许多学者在讨论“全球变暖”这一话题时,常将其作为“科学问题”来讨论。实际上,在涉及这种超长时段的复杂问题时,现在许多标准的科学验证方法都是有局限性的,因而从历史的角度来讨论这个问题,有其特殊意义。但众所周知,历史学家在建构历史时,必须依赖史科之外的东西,而“全球变暖”涉及长时段的气侯变迁,文字记载往往十分缺乏,只有通过地质材料间接推测;而且地球不是人类,它的行为和规律,不可能借助“史科之外的东西”来推测。所以,___________________________。 填入画横线部分最恰当的一句是()

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D.积累丰富准确的地质材料形成证据链很难实现

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