当调节器输入为正偏差(PV-SV>0)时,调节器输出信号随输入正偏差信号的增大而减少,该调节器则为反作用调节器。
参考答案:对
Mrs Smart is going to take her son, Clark, to see an eye doctor, but Clark has school in the morning and piano classes on Monday and Friday afternoons. And Mrs Smart is free (空闲)only in the afternoon. Here are the doctor’s office hours.
小题1:Where are Mrs Smart and Clark going?
A.They’re going to the dentist.
B.They’re going to the supermarket
C.They’re going to see the eye doctor.
D.They’re going to the zoo.小题2: When will be the best time for Mrs Smart to take Clark to see the doctor?
A.Monday
B.Tuesday
C.Wednesday
D.Friday小题3:What does Clark do on Monday and Friday afternoons?
A.he has a toothache
B.He has piano lessons
C.He goes to the doctor.
D.He has swimming lessons.小题4:How many days a week does the doctor work in the morning?
A.Two days
B.Three days
C.Four days
D.Five days小题5:Which day doesn’t the doctor work in a week?
A.Saturday
B.Sunday
C.Every day
D.Friday
有以下程序
#include
struct A
{ int a; char b[10]; double c;};
void f(struct A t);
main()
{ struct A a={1001,"ZhangDa",1098.0};
f(a); printf("%d,%s,%6.1f\n",a.a,a.b,a.c);
}
void f(struct A t)
{ t.a=1002; strcpy(t.b,"ChangRong");t.c=1202.0;}
程序运行后的输出结果是()
A.1001,zhangDa,1098.0
B.1002,changRong,1202.0
C.1001,ehangRong,1098.O
D.1002,ZhangDa,1202.0