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【单选题】
已知某LTI连续系统当激励为f(t) 时,系统的零状态响应为yf1(t) , 零输入响应为ys1(t) , 全响应为y1(t) , 若系统的初始状态不变,激励为2f(t) , 系统的全响应y2(t) 等于A.
2yf1(t)+ys1(t)
B.
yf1(t)
C.
yf1(t)+2ys1(t)
D.
2y1(t)
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举一反三
【单选题】Ben derived a lot of ______ from his boss’s apology. A. comfort B. ease C. gratification D.
A.
comfort
B.
ease
C.
gratification
D.
satisfaction
【单选题】The students were ______ by his humorous words.
A.
carried away
B.
carried in
C.
carried out
D.
carried on
【单选题】We _____ his luggage; his brother carried it himself.
A.
needn’t have carried
B.
didn’t need carrying
C.
needed to have carried
D.
didn’t need to carry
【单选题】控制系统引入积分作用是为了消除余差,但积分的引入会使系统产生振荡现象。而引入微分作用是为了克服( )对系统的影响。
A.
纯滞后
B.
容量滞后
C.
传输滞后
D.
时滞
【单选题】What is true of the past definitions of happiness?
A.
They were based on self-gratification.
B.
They varied greatly.
C.
They were based on lifestyles.
【单选题】We his luggage; his brother carried it himself.
A.
needn’t have carried
B.
didn’t need carrying
C.
needed to have carried
D.
didn’t need to carry
【多选题】石决明中杂色鲍的性状特征是
A.
长卵圆形，内面观略呈耳形
B.
表面有多数螺肋和细密生长线
C.
螺旋部小，体螺部大
D.
内面具珍珠样彩色光泽
E.
末端4～5个开孔，孔口突出壳面
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