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【单选题】
细胞膜流动镶嵌模型,是哪一年发现的?A.
1970.0
B.
1971.0
C.
1972.0
D.
1973.0
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皮皮学刷刷变学霸
举一反三
【单选题】下列有关领苯二甲酸酯的的说法错误的是()
A.
可通过呼吸道消化道和皮肤接触直接进入人和动物体内
B.
毒性随分子中醇基碳原子数的增加而减弱
C.
毒性随分子中醇基碳原子数的增加而增加
D.
工业上，酞酸酯主要用作塑料制品的塑化剂
【简答题】Crazy is our new normal. With two age boys and three little boys, our family is restless- to the baseball field, track field (田径场) and piano lessons. Even though we've limited（限制） each boy's activ...
【简答题】If you calculate the effect of something, you ____________it.
【单选题】最小重量机器设计问题。某设备需要4种配件，每种1件，有3个供应商提供这些配件，下面表格给出相关的价格和每种配件的重量。从中选择4种配件，使得总价值不超过120，总重量最轻。【图片】使用回溯算法，该问题的解为4维向量，其中xi代表第i个零件的供应商标号。该问题的搜索空间是
A.
排列树
B.
3 叉树
C.
子集树
D.
4叉树
【单选题】Why couldn't the fire spread to the south?
A.
Because there was a lake there.
B.
Because there was a river there.
C.
Because there were a lot of firemen there.
D.
Because there was a path there.
【简答题】完形填空 Is the art of conversation dying? The other day, my wife 1 two age children did something we haven't 2 for ages. It didn't require the Internet, a TV screen, batteries… or anything else for t...
【简答题】Two(age) helped the old lady with her heavy bags
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