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【单选题】
在恶劣天气到来前的防范工作包括:1加固货物;2紧固通风设备;3舱盖;4密切注意气象变化A.
①②③④
B.
①②③
C.
②③④
D.
①③④
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【单选题】For the system in Fig., determine the Nyquist plot and apply the Nyquist criterion to determine the range of values of K (k>0) for which the system is stable 提示:nyquist图不能包围(-1,j0)点, 与实轴负半轴的交点虚部为零,计算出...
A.
0
B.
0
C.
0
D.
0
【单选题】For the system in Fig., determine the Nyquist plot and apply the Nyquist criterion to determine the number of roots in the right half plan (RHP) for those values of K for which the system is unstable.
A.
0
B.
1
C.
2
D.
3
【单选题】Figure shows the Nyquist plot of the open loop transfer function G(s)H(s) of a system. If G(s)H(s) has one right hand pole, the closed loop system is
A.
always stable
B.
unstable with one closed loop right hand pole
C.
unstable with two closed loop right hand poles
D.
unstable with three closed loop right hand poles
【单选题】The nyquist plot of 1/[s(0.1*s+1)(0.5*s+1)] is a) b) 在原点处放大可见相位角为-270° c) d)
A.
a
B.
b
C.
c
D.
d
【判断题】根据GB50396-2007《出入口控制系统工程设计规范》，出入口控制系统主要由识读部分、传输部分、管理与控制部分和执行部分以及相应的系统软件组成。
A.
正确
B.
错误
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