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【多选题】
下列哪些物质运输方式不需要消耗ATP()
A.
协助扩散
B.
自由扩散
C.
质子泵
D.
内吞作用
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【单选题】硅酸盐水泥在磨细时,一定要加入适量石膏,这是为了起( )作用。
A.
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B.
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C.
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D.
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A.
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A.
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B.
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【单选题】( )连接从结果中删除其它被连接表中没有匹配的所有行
A.
inner join
B.
left join
C.
right join
D.
cross join
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