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单项选择题

离散周期序列时移，引起相位变化的差分是不同的。
A、正确
B、错误

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判断题
我们通常所说的零频信号即为直流信号。（   ）
正确
错误
单项选择题
“可持续发展(Sustainable Development)”的观念第一次在国际社会正式提出是在( )。
A.罗马俱乐部《增长的极限》
B.1972年联合国在斯德哥尔摩召开的人类环境会议通过的《人类环境宣言》
C.1976年人居大会(Habitat)
D.1978年联合国环境与发展大会
单项选择题
Some villagers were going to celebrate an important wine festival（酒宴）in a few days′time,so?they borrowed a huge barrel from the nearest town,put it in the village square,and decided that each?of them should empty a bottle of the best wine he had into it,so that there should be plenty at the?feast（宴会）.
One of the villagers thought he would be very clever."If I pour a bottle of water in,instead of?wine,no one will notice it,"he said to himself,"because there will be so much excellent wine in the?barrel that?the water will be lost in it."
The night of the feast arrived.Everybody gathered in the village square with their bowls and?their glasses for the wine.The tap（塞子）on the barrel was opened,but what came out was pure?water.Everyone in the village had had the same idea.
One of the villagers poured a bottle of water into the barrel because__________.
A.thewineinthebarrelwastoothick
B.theothersputwaterintoittoo
C.hewasclevererthantheothers
D.hetriedtocheattheothers
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