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【单选题】
时间常数为 T 的一阶系统,在单位阶跃信号作用下,t=( )时,过渡过程基本结束。
A.
1T~2T
B.
2T~3T
C.
3T~4T
D.
4T~5T
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举一反三
【多选题】监视与诊断过程中的信号检测必须满足以下（ ）的要求。 A 随机性 B 在线性 C 实时性 D 一致性
A.
随机性
B.
在线性
C.
实时性
D.
一致性
查看完整题目与答案
【单选题】I was told that my father had emailed me the other day, but I didn't receive ________. [     ]
A.
it
B.
one
C.
anything
D.
nothing
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【单选题】----I didn't receive any e-mail from you,why? ----( )
A.
Oh,my compuer is down.
B.
It doesn't matter.
C.
I think it's OK.
D.
Never mind.
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【单选题】I was on __________ last week and didn't receive your fax.
A.
vacation
B.
vocation
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【单选题】在下列有关Windows操作系统(这里指Windows 95及其以后的版本)的多任务处理功能的叙述中,正确的是( )。
A.
在多任务处理过程中，宏观上前台任务与后台任务都能得到CPU的响应（处理）
B.
由于CPU具有并行执行指令的功能，所以操作系统才能同时进行多个任务的处理
C.
如果用户只启动一个应用程序，那么该程序就可以自始至终地独占CPU
D.
Windows操作系统采用协作方式支持多个任务的处理
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【单选题】He said he had called me to return home, but I didn't receive _____. [     ]
A.
one
B.
it
C.
anyone
D.
anything
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【单选题】I wrote to that company a week ago, but I didn't receive any reply．
A.
information
B.
answer
C.
word
D.
message
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【简答题】Getting plenty of exercise is very important. I enjoy swimming very much. Last summer I went to the beach every day. I plan to go there this summer too, but I may not be able to, I have a new job. Som...
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【单选题】I ______ a letter from him since he left. [     ]
A.
didn't receive
B.
haven't got
C.
didn't have
D.
haven't had
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【单选题】I______ from him since he left. A. didn't receive B. haven't got C. didn't have D. haven't heard
A.
didn't receive
B.
haven't got
C.
didn't have
D.
haven't heard
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相关题目：
【多选题】监视与诊断过程中的信号检测必须满足以下（ ）的要求。 A 随机性 B 在线性 C 实时性 D 一致性
A.
随机性
B.
在线性
C.
实时性
D.
一致性
查看完整题目与答案
【单选题】I was told that my father had emailed me the other day, but I didn't receive ________. [     ]
A.
it
B.
one
C.
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D.
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查看完整题目与答案
【单选题】----I didn't receive any e-mail from you,why? ----( )
A.
Oh,my compuer is down.
B.
It doesn't matter.
C.
I think it's OK.
D.
Never mind.
查看完整题目与答案
【单选题】I was on __________ last week and didn't receive your fax.
A.
vacation
B.
vocation
查看完整题目与答案
【单选题】在下列有关Windows操作系统(这里指Windows 95及其以后的版本)的多任务处理功能的叙述中,正确的是( )。
A.
在多任务处理过程中，宏观上前台任务与后台任务都能得到CPU的响应（处理）
B.
由于CPU具有并行执行指令的功能，所以操作系统才能同时进行多个任务的处理
C.
如果用户只启动一个应用程序，那么该程序就可以自始至终地独占CPU
D.
Windows操作系统采用协作方式支持多个任务的处理
查看完整题目与答案
【单选题】He said he had called me to return home, but I didn't receive _____. [     ]
A.
one
B.
it
C.
anyone
D.
anything
查看完整题目与答案
【单选题】I wrote to that company a week ago, but I didn't receive any reply．
A.
information
B.
answer
C.
word
D.
message
查看完整题目与答案
【简答题】Getting plenty of exercise is very important. I enjoy swimming very much. Last summer I went to the beach every day. I plan to go there this summer too, but I may not be able to, I have a new job. Som...
查看完整题目与答案
【单选题】I ______ a letter from him since he left. [     ]
A.
didn't receive
B.
haven't got
C.
didn't have
D.
haven't had
查看完整题目与答案
【单选题】I______ from him since he left. A. didn't receive B. haven't got C. didn't have D. haven't heard
A.
didn't receive
B.
haven't got
C.
didn't have
D.
haven't heard
查看完整题目与答案