皮皮学，免费搜题
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搜题
【单选题】
周期信号的频谱是（ ），每条谱线只出现在基频的整数倍上。
A.
连续的
B.
离散的
C.
不确定的
D.
随机的
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参考解析：
知识点：
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举一反三
【单选题】Asia's oil needs
A.
are greater than its supply.
B.
are less than its supply.
C.
will not overtake North America within five years.
D.
will not overtake any other country in the world.
查看完整题目与答案
【判断题】TN系统分为TN-S,TN-C-S,TN-P三种类型。()
A.
正确
B.
错误
查看完整题目与答案
【单选题】Although ______, new deposits of oil will be found, sooner or later, the world's supply will be exhausted.
A.
in all likelihood  
B.
in all possibility
C.
in all circumstances
D.
in all conditions
查看完整题目与答案
【单选题】Laugh, and the world laughs with you; _______, and you weep alone
A.
weeps
B.
weeped
C.
weep
D.
weeping
查看完整题目与答案
【多选题】TN系统有如下哪几种类型?()
A.
TN-C-S系统
B.
TN-C系统
C.
TN-P系统
D.
TN-S系统
查看完整题目与答案
【判断题】TN系统有三种形式，即TN-C、TN-S、TN-C-S系统。游乐设施的接地方式采用TN-S系统或TN-C-S系统。()
A.
正确
B.
错误
查看完整题目与答案
【单选题】The author sees the reform. of Bolivia's industry as a sign of ______.
A.
less oil supply and high oil price in the world
B.
nationalization of industry in other countries
C.
smaller share of oil reserves in state-owned companies
D.
more efficiency in exploitation and processing of oil
查看完整题目与答案
【单选题】职业资格是指从事某一职业所必备的学识、技术和( )的基本要求。
A.
经验
B.
能力
C.
水平
D.
道德素质
查看完整题目与答案
【判断题】TN系统有三种形式，即TN-C、TN-S、TN-C-S系统。游乐设施的接地方式采用TN-S系统。()
A.
正确
B.
错误
查看完整题目与答案
【单选题】The old proverb has it that 'laugh and the world laughs with you cry and you cry alone.' What's new is the discovery by University of California, San Francisco scientists that the expression on your f...
A.
controlled by their facial expression
B.
influenced by their facial expression
C.
identical with their facial expression
D.
contrary to their facial expression
查看完整题目与答案
相关题目：
【单选题】Asia's oil needs
A.
are greater than its supply.
B.
are less than its supply.
C.
will not overtake North America within five years.
D.
will not overtake any other country in the world.
查看完整题目与答案
【判断题】TN系统分为TN-S,TN-C-S,TN-P三种类型。()
A.
正确
B.
错误
查看完整题目与答案
【单选题】Although ______, new deposits of oil will be found, sooner or later, the world's supply will be exhausted.
A.
in all likelihood  
B.
in all possibility
C.
in all circumstances
D.
in all conditions
查看完整题目与答案
【单选题】Laugh, and the world laughs with you; _______, and you weep alone
A.
weeps
B.
weeped
C.
weep
D.
weeping
查看完整题目与答案
【多选题】TN系统有如下哪几种类型?()
A.
TN-C-S系统
B.
TN-C系统
C.
TN-P系统
D.
TN-S系统
查看完整题目与答案
【判断题】TN系统有三种形式，即TN-C、TN-S、TN-C-S系统。游乐设施的接地方式采用TN-S系统或TN-C-S系统。()
A.
正确
B.
错误
查看完整题目与答案
【单选题】The author sees the reform. of Bolivia's industry as a sign of ______.
A.
less oil supply and high oil price in the world
B.
nationalization of industry in other countries
C.
smaller share of oil reserves in state-owned companies
D.
more efficiency in exploitation and processing of oil
查看完整题目与答案
【单选题】职业资格是指从事某一职业所必备的学识、技术和( )的基本要求。
A.
经验
B.
能力
C.
水平
D.
道德素质
查看完整题目与答案
【判断题】TN系统有三种形式，即TN-C、TN-S、TN-C-S系统。游乐设施的接地方式采用TN-S系统。()
A.
正确
B.
错误
查看完整题目与答案
【单选题】The old proverb has it that 'laugh and the world laughs with you cry and you cry alone.' What's new is the discovery by University of California, San Francisco scientists that the expression on your f...
A.
controlled by their facial expression
B.
influenced by their facial expression
C.
identical with their facial expression
D.
contrary to their facial expression
查看完整题目与答案