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定向井的三要素是什么？

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19世纪统一德国的是奥地利。

A. 正确
B. 错误

Seamless mild steel is used for steam (also copper for moderate pressure and temperature), h-pair, feed discharge and all oil fuel pressure pipingsAccording to the above sentence, which of the following statements is not true?（）

A. Both seamless mild steel and copper may be used for middle pressure steam
B. "hpair" means high pressure air
C. The feed piping of the boilers can be made of seamless mild steel
D. All oil pipings are made of mild steel

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（）不是决定局域网性能的基本技术。

A. 传输介质
B. 拓扑结构
C. 传输协议
D. 介质访问控制协议

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在紧急情况下，可操作脱扣杆进行（）。

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