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河南成教 / 河南理工大学
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1
[单选题]
气压与海拔的关系是[ ]。
A.
海拔愈高,气压愈高
B.
正比关系
C.
海拔愈高,气压愈低
D.
反比关系
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河南理工大学
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佳题速递:
It is obvious that television has both advantages and disadvantages. In the first place, television is not only a convenient source of pleasure, but also a quite cheap one. For a family of four, for example, it is more convenient as well as cheaper to sit comfortably at home, with so many interesting programs available, than to go out for something else. There is no transport to arrange. They do not have to pay for expensive seats at the theatre, or the like, only to discover, perhaps, that the show is disappointing. All they have to do is to turn a knob, and they can see plays and shows of every kind, not to mention the latest current events. Some people, however, maintain that this is just where the danger lies. Those who watch television need do noting. They are completely passive and have everything presented to them without any effort on their part.
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如果 系统的单位冲激响应h(t)= (t),则当该系统的输入信号f(t)= (t)时,其零状态响应为 。如果一LTI系统的单位冲激响应h(t)= (t),则当该系统的输入信号f(t)= (t)时,其零状态响应为 。
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