如图8.8-2所示X，Y信号，如下选项中完成F=X-Y数值运算的是（）。https://assets.asklib.com/psource/2015103016242415313.jpg

A . mx（F）=0，my（F）=Fa，mz（F）=0 B . mx（F）=0，my（F）=0，mz（F）=0 C . mx（F）=Fa，my（F）=0，mz（F）=0 D . mx（F）=Fa，my（F）=Fa，mz（F）=Fa

A . t1 B . t2 C . t3 D . t4

A . 0 B . 50N C . 200N D . 100N

A . 0.5ms B . 0.6667ms C . 2ms D . 3m

A . 0 B . 50N C . 200N D . 100N

A .https://assets.asklib.com/psource/2015110110334621588.jpg B .https://assets.asklib.com/psource/2015110110340299751.jpg C .https://assets.asklib.com/psource/201511011034175015.jpg D .https://assets.asklib.com/psource/2015110110343034391.jpg

A . 33.33Hz B . 50Hz C . 150Hz D . 300Hz

A .https://assets.asklib.com/images/image2/2017051115270093223.jpg B .https://assets.asklib.com/images/image2/2017051115270349700.jpg C .https://assets.asklib.com/images/image2/2017051115270562426.jpg D .https://assets.asklib.com/images/image2/2017051115270773566.jpg

A .https://assets.asklib.com/psource/2015103016355461240.jpg B .https://assets.asklib.com/psource/2015103016355461240.jpg C .https://assets.asklib.com/psource/2015103016355461240.jpg D .https://assets.asklib.com/psource/2015103016355461240.jpg

A .https://assets.asklib.com/psource/2015110110064980810.jpg B .https://assets.asklib.com/psource/201511011007091323.jpg C .https://assets.asklib.com/psource/2015110110072370179.jpg D .https://assets.asklib.com/psource/2015110110073874078.jpg

设函数y=f(x)的图形如图2-3，试在图2-3(a).(b).(c).(d)中分别标出在点x₀的dy-Δy及Δy-dy，并说明其正负。 <img src='https://img2.soutiyun.com/ask/2020-08-06/965554359080238.png' /> <img src='https://img2.soutiyun.com/ask/2020-08-06/965554373854084.png' />

有如下程序 main() { float x=2.0,y; if(x＜0.0)y=0.0; else if(x＜10.0)y=1.0/x; else y=1.0; printf("%f\n",y); } 该程序输出结果是______。 A．0 B．0.25 C．0.5 D．1

设有如下过程： Sub ff(x，y，z) x=y+z End Sub 下列选项中所有参数的虚实结合都是传址方式调用的是()。 A．Call ff(5,7,z) B．Call ff(x,y,z) C．Call ff(3+x,5+y,z) D．Call ff(x+y,x-y,z)

<img src='https://img2.soutiyun.com/shangxueba/ask/18114001-18117000/18114494/2017070417491423714.jpg' /> A．0.5ms B． 0.6667ms C． 2ms D． 3m

<img src='https://img2.soutiyun.com/shangxueba/ask/18366001-18369000/18366604/2015103016200329921.jpg' /> A．<img src='https://img2.soutiyun.com/shangxueba/ask/18366001-18369000/18366604/2015103016201852323.jpg' /> B．<img src='https://img2.soutiyun.com/shangxueba/ask/18366001-18369000/18366604/2015103016203316643.jpg' /> C．<img src='https://img2.soutiyun.com/shangxueba/ask/18366001-18369000/18366604/2015103016204578274.jpg' /> D．<img src='https://img2.soutiyun.com/shangxueba/ask/18366001-18369000/18366604/201510301620588928.jpg' />

设X(e)是如图P2.11所示的x(n)信号的傅里叶变换,不必求出X(e).试完成下列计算: <img src='https://img2.soutiyun.com/ask/2020-12-26/977834448728036.png' /> <img src='https://img2.soutiyun.com/ask/2020-12-26/977834472064371.png' />

已知f(x)的图形如图1-13所示,那么y=<img src='https://img2.soutiyun.com/ask/2020-12-18/977150434115773.png' />的图形是(). <img src='https://img2.soutiyun.com/ask/2020-12-18/977150502765699.png' /> <img src='https://img2.soutiyun.com/ask/2020-12-18/977150478766327.png' /> <img src='https://img2.soutiyun.com/ask/2020-12-18/977150488581888.png' />

设有如下过程； Sub ff(x,y,z) x=y+Z End Sub 下列选项中所有参数的虚实结合都是传址方式调用的是()。 A．Call ff(5,7,2) B．Call ff(x,y,z) C．Call ff(3+x,5+y,z) D．Call ff(x+y,x-y,z)

设函数f(x)在定义域内可导,y=f(x)的图形如图3-1所示，则导函数f'(x)的图形为图3-2中所示的四个图形中的哪一个？ <img src='https://img2.soutiyun.com/ask/2020-11-11/973952363335943.png' /> <img src='https://img2.soutiyun.com/ask/2020-11-11/973952374855602.png' />

A．f’(x)&lt;0 B．f(x)单调下降 C．f’(x) 单调下降 D．f(x)=0 有唯一实根

A．p-q B．q-p C．p+q D．2（p-q）

<img src='https://img2.soutiyun.com/ask/2020-12-02/975761521829848.png' />