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【单选题】
下列关于偶然误差的说法正确的是________。A.
在一定的观测条件下,偶然误差的绝对值不会超过一定的限值。
B.
绝对值大的误差比绝对值小的误差出现的可能性大。
C.
绝对值相等符号相反的正负误差出现的可能性不同。
D.
有限的观测次数下,偶然误差的算术平均值趋近于零。
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举一反三
【单选题】It took me about an hour to ________ my intention ________ her.
A.
get, across
B.
put, across
C.
get, across to
D.
put, across to
【简答题】2 2×4 + 2 4×6 + 2 6×8 + 2 8×10 + 2 10×12 ．
【判断题】定位基准与设计基准不重合时,工序尺寸及其公差的换算方法是,先找出以设计尺寸为封闭环、以工序尺寸为组成环的工序尺寸链,再按尺寸链“反计算”形式确定所求工序尺寸及其公差。
A.
正确
B.
错误
【单选题】听力原文：M: You should have seen the line at the housing office. It took me an hour to make my dormitory deposit for next year. Have you made yours yet? W: No, I'm not sure I'm going to. M: There's not mu...
A.
When to move.
B.
Where to live the following year.
C.
How much time to spend at home.
D.
Whose house to visit.
【单选题】听力原文：M: You should have seen the line at the housing office. It took me an hour to make my dormitory deposit for next year. Have you made yours yet? W: No, I'm not sure I'm going to. M: There's not mu...
A.
When to move.
B.
Where to live the following year.
C.
How much time to spend at home.
D.
Whose house to visit.
【简答题】It took me about half an hour _________ (do) my homework last night.
【简答题】根据句意及首字母填写所缺单词。 小题1:Can I have a glass of orange j________? 小题2:It took me about an hour to f_________my homework. 小题3:The maths problem is very d___________, I can’t do it. 小题4:I’m very tired after a...
【单选题】听力原文：M: You should have been in the line at the housing office. It took me an hour to make my dormitory depose for next year. Have you made yours yet? W: No, I'm not sure I'm going to. M: There's not ...
A.
when to move
B.
where to live the following year
C.
how much time to spend at home
D.
whose house to visit
【单选题】It took me about an hour ______ the letter lastnight.
A.
writing
B.
to write
C.
wrote
D.
write
相关题目：
【判断题】定位基准与设计基准不重合时,工序尺寸及其公差的换算方法是,先找出以设计尺寸为封闭环、以工序尺寸为组成环的工序尺寸链,再按尺寸链“反计算”形式确定所求工序尺寸及其公差。
A.
正确
B.
错误