黏结剂的性质包括黏度、分子量、极性、空间结构和体积收缩等。
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动物致畸的三段试验的目的是
A. I段试验测试环境因素的对胚胎毒性和致畸性
B. Ⅱ段试验测试环境因素的对受孕率和生殖功能的影响
C. Ⅱ段试验测试环境因素对分娩后发育的影响
D. Ⅲ段试验测试环境因素对分娩后发育的影响
E. Ⅲ段试验测试环境因素对受孕率和生殖功能的影响
Why did they think $250 could be a reasonable price？
A. Because it was cheaper than the previous price
Because customers can divide them into several parts to eat
C. Because it was exactly the cost price
D. Because it was not the first time that the burger had been overcooked.
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