A.≤80%,≥30% B.≤80%,≥10% C.≤90%,≥30%
A.瞬間變成無窮大,其余時(shí)間為零 B.輸出為零 C.瞬間變成零,其余時(shí)間為無窮大
A.被控對(duì)象 B.被控變量 C.操作變量