下列有关于系统误差产生原因说法不正确的是（）A.系统误差按其产

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问题单项选择题

下列有关于系统误差产生原因说法不正确的是（）

A.系统误差按其产生的原因可分为仪器误差、方法误差和操作误差等

B.系统误差可以用对照试验、空白试验、校正仪器等方法加以校正

C.仪器本身精密不够或未经校正不会引起系统误差

D.重量分析中，由于沉淀的溶解或因吸附某些杂质亦可产生系统误差

答案

参考答案：C

填空题

单词拼写。

1.I must make an a to her for breaking her glasses.

2.Tom was a in the book when walking so that he was knocked down by a car.

3.I’ll e my apple for your orange.

4.There are more than 42 countries where the m of the people speak English.

5.Research i that eating habits are changing fast.

6.The food made me lose my ( 食欲).

7.The students should be (谨慎的) not to make any mistakes in spelling.

8.He is (熟悉) with three languages.

9.The timely (到达) of the police prevented the situation from becoming worse.

10.He (低语) a word to her in her ear so that the others couldn’t catch him.

单项选择题

《煤矿矿井机电设备完好标准》规定，滚动轴承允许最高温度应小于（）。

A、65°

B、70°

C、75°

D、80°