2. 专升本
  3. ______at temperatures above 1,250°C, clay fuses and becomes nonporous stoneware or porcelain.

______at temperatures above 1,250°C, clay fuses and becomes nonporous stoneware or porcelain.

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问题 ______at temperatures above 1,250°C, clay fuses and becomes nonporous stoneware or porcelain.
选项 A、It is fired
B、When fired
C、Firing
D、When firing it
答案B
解析
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