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【简答题】
电解液由纯硫酸(相对密度1.84)和蒸馏水按一定比例配置而成,相对密度一般为()。
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举一反三
【单选题】急性白血病贫血的主要原因( )
A.
出血
B.
无效性细胞生成
C.
红细胞寿命缩短
D.
红细胞成熟受干扰
E.
造血原料缺乏
【单选题】该病人贫血的原因不包括( )
A.
促红细胞生成素减少
B.
红细胞寿命缩短
C.
造血原料不足
D.
红细胞成熟障碍
E.
水、电解质紊乱
【简答题】John is a famous writer now.But he said he was not a 小题1: student when he was young.He was often late for 小题2:  and didn’t like doing his homework. Sometimes, he slept in class while the teacher was t...
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A.
红细胞寿命缩短
B.
红细胞成熟受干扰
C.
造血原料缺乏
D.
出血
E.
无效性红细胞生成
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A.
细胞是一个有机的统一整体
B.
细胞核的功能比细胞质重要
C.
细胞是生命活动的基本单位
D.
环境影响细胞寿命
【简答题】根据短文内容和首字母的提示,把所缺单词填写在短文后面的横线上。 Many students often 1. c______  about school. They might feel they have too 2. m_______ work to do sometimes, or think the rules are too 3. s_______. We must learn how ...
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