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【单选题】
血细胞分析过程中不属于技术误差的原因是（）A.
血液发生凝固
B.
每次充液后细胞在计数室内分布不完全相同
C.
使用器材不符合要求
D.
采血部位不当
E.
稀释倍数不准
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举一反三
【单选题】John said he’d been working in the office for hours, ______ true.
A.
he was
B.
it was
C.
which was
D.
who was
【单选题】John said he’d been working in the office for an hour, _____ was true.
A.
that
B.
who
C.
which
D.
what
【单选题】John said he’d been working in the office for hours, and ______ true.
A.
he was
B.
it was
C.
which was
D.
who was
【单选题】以下属于随机误差特点的是( )
A.
单向性、重复测定重复出现
B.
在同一条件下重复测定，正负误差出现的机会相等
C.
它对分析结果的影响比较恒定
D.
误差可以估计其大小
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