题目内容
如何理解制造系统的可靠性与复杂性？
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将下列英语段落翻译成汉语：When flying in high altitudes without pressurization, especially above 4000 meters, people will feel a certain hypoxia (lack of oxygen), or even lose consciousness. The pressurized areas are the cockpit, the cabin, the cargo hold and avionics bay. The pressurization of the modern aircraft is regulated by the compressed air. One of the most common sources of compressed air is bleed air from the engines. Another source of compressed air is the bleed air from APU (Auxiliary Power Unit).
1手动控制一般使用刀开关，断路器来接通或断开电动机。
2继电器、接触器是有触点的元件，使用于电动机的简单控制。
3PLC是有触点的元件，可以直接控制电动机。
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