实现比例积分(PI)调节器采用反馈环节的传递函数为()。
A.A
B.B
C.C
D.D
参考答案:D
Everything seemed to be going for the first two days after I arrived in New York.
A.vividly
B.generally
C.frequently
D.smoothly
急性喉炎的临床表现特点不包括()。
A.声嘶
B.喉痛
C.咳嗽多痰
D.咯血
E.痰多不易咳出