题目内容

水俣病的发病机制是

A. 氯化甲基汞进入胃内,再吸收入血,与脑细胞的脂类亲和
B. 甲基汞在胃内转化为氯化甲基汞,再吸收入血,与脑细胞的脂类亲和
C. 甲基汞吸收入血,与脑细胞的脂类亲和,通过胎盘屏障
D. 甲基汞吸收入血,与脑细胞的脂类亲和,穿过血脑屏障
E. 与脑细胞的脂类亲和,穿过m脑屏障,侵犯部位主要在下丘脑

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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。

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

有机硅树脂具有很好的耐水、防水性,但耐候性较差。

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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