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问题
单项选择题
增加制剂的生物学稳定性()
A.枸橼酸盐
B.吐温80
C.羧甲基纤维素钠
D.单硬脂酸铝
E.苯甲酸钠
答案
参考答案:
E
选择题
In 1492, Columbus ______ on one of the Bahama Islands, but the mistook is for an island off India.
A. lands
B. landed
C. has landed
D. had landed
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问答题 简答题
橡胶制品的收缩率?
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