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若要对某点进行比例、旋转变换,首先需要将坐标原点平移至该点,在新的坐标系下做比例或旋转变换,然后在将原点平移回去。()

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最常见的关节脱位是()

A. 先天性脱位
B. 外伤性脱位
C. 习惯性脱位
D. 病理性脱位
E. 完全脱位

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将线段两端点的分区编码逐位取逻辑“与”,若结果为零(非零),则该线段相对于剪裁窗口必为完全不可见。()

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According to the paragraph 3. California has cut the warming effect from diesel emissions

A. using particulate filters on cars and trucks and switching to low-sulfur diesel
B. turning to efficient biomass cook stoves instead of using traditional mud stoves
C. replacing kerosene lamps in villages with solar lamps
D. deploying modern brick kilns

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Cutting emissions of which one of the following pollutants dose not belong to the short-term strategy to deal with global warming？

A. black carbon
B. carbon dioxide
C. methane and lower-level ozone
D. HFCs

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