题目内容

人造石不如超硬石膏性能优越的主要原因是超硬石膏

A. 晶体纯度高
B. 晶体不变形
C. 晶体表面积大
D. 混水率低
E. 凝固膨胀率大

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The next morning she told us that the last question didn't depart till well after midnight.

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降钙素的生理作用是降低血钙浓度，下列的作用方式不正确的是

A. 抑制破骨细胞活性
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A. on
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Let's not waste time on matters of no important. We have other vital problems to deal with.()

A. Let's not
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C. vital
D. deal with