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【单选题】
下列对离散叶变换( DFT )的性质论述中错误的是
A.
DFT 是一种线性变换
B.
DFT 具有隐含周期性
C.
DFT 可以看作是序列 z 变换在单位圆上的抽样
D.
利用 DFT 可以对连续信号频谱进行精确分析
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【简答题】Biomass energy is a source of energy. (renewable / non-renewable)
【单选题】兼有复合树脂的美观和玻璃离子释放氟离子双重优点的是
A.
氧化锌丁香油粘固剂
B.
氢氧化钙
C.
复合体
D.
银汞合金
E.
磷酸锌粘固剂
【简答题】现场审核发现,项目部用1号吊车吊管桩预制件,采用的方法是用钢丝绳捆绑在预制件的中间部位起吊,导致预制件受力不均,预制件有裂纹。
【判断题】Biomass energy is not universal and accessible.
A.
正确
B.
错误
【单选题】Why does the author encourage power plants to use biomass?
A.
To prevent the waste of energy.
B.
To increase production safety.
C.
To reduce pollution.
D.
To save money.
【单选题】(paragraph 8) Biomass energy is abundant but
A.
is very expensive to use.
B.
is air-polluting and costly.
C.
is unreliable& expensive to produce.
D.
is environmentally unfriendly.
【简答题】Biomass energy (生物能).often forgotten as a promising alternative (替代物) to oil, received its day in the sun with the gathering of the Bio-Energy World Congress and Exposition in Atlanta, Georgia, late i...
【单选题】如果电脑出故障突然死机,如何找到刚刚制作并没有保存的文件()。
A.
在电脑文件中找到3dsmax autoback文件夹
B.
重新打开3DsmAx会有恢复文件
C.
重新打开3DsmAx在菜单栏 Customize设置中寻找
D.
用撤销来恢复
【判断题】In a broad sense, biomass energy is also a form of solar energy.
A.
正确
B.
错误
【简答题】Biomass energy is a source of energy.
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