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在自动调节中，PID调节器主要靠比例作用避免过分振荡，靠积分作用消除静态偏差，靠微分作用减少动态偏差。()

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Question 3
John wrote to Mary asking "Will you sell your second-hand car？ Please tell me your lowest price." Mary replied in a letter: "The lowest price for my used car is ＄2,000." John then sent the second letter to Mary saying that he agreed to buy the used car for ＄2,000. But before Mary received the letter from John, Mary sold her used car to David.
Can John sue Mary to enforce the contract？

引起自动调节系统被调量波动的因素叫干扰。()

工业自动化仪表就是计算机。()

计算机控制调节系统中，I/A通道越多，控制的回路就越多。()