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问题 单项选择题 A1/A2型题

下列因素中能造成系统误差的为（）

A.气流微小波动

B.蒸馏水不纯

C.读数读错

D.计算错误

E.操作不熟练

答案

参考答案：B

填空题
根据短文内容，选择适当的单词，并用其正确形式填空。每个词限用一次。
         
 wear,  invent,  mean,  enough,  teach,  read,  invention,  information,  memorize,  who     
    Modern glasses were 1.        around 1,000 years ago.  They were more than just aconvenient way 2.        _ with. Before glasses, writers. scientists or 3.        _whocould not see properly had to 4.           everything.  After about ten years of poor eyesight,they could not remember well 5.           and could not work. Glasses 6.          thatpeople could work into their old age.  People 7.           wanted to remember 8.        _
could write it clown and read it.  Glasses arc one of the world's greatest 9.           and wereprobably
10.           by the people who need them.
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填空题
把
1
7
化成小数后，小数点后第一百位上的数字是______，若把小数点后面一百个数字相加，所得的和是______．
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