试题与答案

从安全角度考虑气焊点火时,宜采用()。A、先开乙炔调节阀,点火后再开氧气调节阀 B、先

题型:单项选择题

题目:

从安全角度考虑气焊点火时,宜采用()。

A、先开乙炔调节阀,点火后再开氧气调节阀

B、先开氧气调节阀,后开乙炔调阀后点火

C、一样

D、以上选项都错误

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:设两灯对人眼的张角为θ,光学仪器的最小分辨角为当θ≥θ0时人眼能分辨,其中θ=θ0为恰好能分辨,即而由几何关系式中α——两车灯之间的距离;L——人与车之...

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     Here's some advice for you: have a certain time each day and a quiet place with good lighting for study, so that you can concentrate on your study without interruptions(中断); have everything ready before you

sit down to study, a dictionary, paper, a pen and books; be sure you understand what you should learn

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forget the importance of review and preview.

1. The main purpose of the article is______

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