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【多选题】
下列叙述中正确得是( )
A.
若y(t)=f(t)*h(t),则y(2t)=2f(2t)*h(2t)
B.
若f1(t)和f2(t)均为奇函数,则f1(t)*f2(t)为偶函数
C.
卷积法只适用于线性时不变系统的分析
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举一反三
【单选题】施工许可证应在领取()个月内开工。
A.
1
B.
3
C.
6
D.
12
【单选题】施工许可证应在领取三个月内开工,因故不能开工的应向发证机关申请延期,延期以()次为限,每次不得超过()个月。()
A.
2,2
B.
2,3
C.
3,2
D.
3,3
【简答题】A good modern newspaper is an extraordinary piece of reading. It is unusual for what it contains: the news from local crime to international politics, from sports to business to fashion to science, an...
【简答题】设a、b、c分别表示三角形的三边,从键盘输入a、b、c的值,根据数学公式 ,其中,s=(a+b+c)/2,计算三角形的面积(要求输入的三边长度能构成三角形)。 程序中用到的变量请都定义为float类型,输出结果时,只输出2位小数。 例如 输入格式为:3,4,5 则输出格式为:area=6.00
【单选题】在机器安全防护装置中,( )是一种阻止身体的任何部分靠近危险区域的设施。
A.
联锁安全装置
B.
隔离安全装置
C.
可调安全装置
D.
跳闸安全装置
【单选题】Main diesel engine con tr ol can be obtained by the bridge
A.
at any time
B.
only after the engine room con tr ol station is switched to "bridge control"
C.
whenever the secondary station is switched to "bridge con tr ol"
D.
Whenever the engine side con tr ol station is switched to "bridge con tr ol"
【判断题】建设单位应当在领取施工许可证后及时开工,开工期限为领取施工许可证之日起3个月内。
A.
正确
B.
错误
【单选题】已知有如下定义和输入语句,若要求变量a1,a2,c1,c2的值分别是10,20,A和B,当从第一列开始输入数据时,正确的数据输入方式是( )。(说明:选项中□表示从键盘输入的空格) int a1,a2; char c1,c2; scanf("%d%c%d%c",&a1,&c1,&a2,&c2);
A.
10□A20B
B.
10□A□20□B
C.
10A20B
D.
10A20□B
【单选题】According to the passage, which of the following statements is NOT true?
A.
Computers can translate dry and difficult phrase.
B.
Computers can understand sensitive language.
C.
Computers can translate technical language.
D.
Computers can understand pre-programmed word.
【单选题】Due to the widespread ___________   of this medical technology, more diseases can be discovered and treated at an early stage. [     ]
A.
presentation
B.
application
C.
qualification
D.
appreciation
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