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问题
填空题
目前，注塑厂使用的色料主要包括（）、色母。
答案
参考答案：色粉
填空题
在直角坐标系中，点M（3，-5）到x轴的距离是_____.到原点的距离是_____.
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选择题
The teachers _______ the office for a few minutes when we arrived. We didn't meet them.
A. had been away from
B. had left
C. have been away from
D. have left
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