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【单选题】
xint型变量,则执行以下语句后,x(  )x=10; x*=x;

10
20
100
0
【单选题】
xint型变量,则执行以下语句后,x( ) x=10; x+=x;

10
20
40
30
【单选题】
设时域信号x(t)频谱X(f),则时域信号x(t-t0)频谱()。

X(f+f0)
X(f-f0)
【判断题】
在使用var x=1声明变量x之后,赋值语句x=今天天气真好将出错。

正确
错误
【单选题】
You ____ that letter to James. However, you didn’t.

ought to write
ought to have written
should write
should be writing
【单选题】
I __________ going to the doctor, but I wish I hadn’t.

pick out
make out
give off
put off
【单选题】
下面___组命令,将变量count值赋值1。

Declare@countSelect@count=1
Dimcount=1Selectcount=1
DeclarecountSelectcount=1
Dim@countSelect@count=1
【单选题】
If only he __________ what I tell him, but he won’t.

had done
would do
would have done
has done
【单选题】
下列为变量赋值语句中,错误( )。

SET @X = 10
SELECT @X = 10
SET @X = 10 + 10
SET @X = 10 + A
【单选题】
xfloat型变量,ydouble型变量,aint型变量,blong型变量, cchar型变量,则表达式x+y*a/x+b/y+c( )类型。

int
long
double
char