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问题 单项选择题

精密度是指

A．测量值与真实值接近的程度

B．测量值与回收率接近的程度

C．同一均匀样品，经多次测定所得结果之间的接近程度

D．测量方法排除干扰的能力

E．测试结果与试样中被测物浓度成正比关系的程度

答案

参考答案：C

改错题

下面短文中有十处语言错误。请在有错误的地方增加、删除或修改某个单词。

增加：在缺词出加一个漏字符号（^），并在其下面写上改加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，在该词下面写上修改后的词。

注意：1.每处错误及修改均仅限一词;

2.只允许修改10处，多者（从第11处起）不计分。

Today is Sunday. We had not lessons. After breakfast I wanted to do with my homework when Li Lei rang me. He asked me to go to the cinema with he. I agreed, but I have to finish my homework first. About an hour later，we went out. In the way we saw Kate; she was mending her bike. She looked very worry.“Let us help you.” Li Lei and I all said. “All right.” And we stopped to help her. There was nothing much wrong with the bike, so it cost us only several minutes time to finish it. Kate was very thankful. When we hurried the cinema, the film had been on for ten minutes. But we felt happy.
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单项选择题

钻井液流动时，越靠近固体边界处钻井液速度（）。

A.越高

B.越低

C.相同

D.不定
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