问题
单项选择题
在正态分布中心向左或向右移动1．50-情况下，西格玛水平Z为3时，其特性落在规范限内的百分比是（）。
A、30.23%
B、69.13%
C、93.32%
D、99.379%
答案
参考答案：C
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在正态分布中心向左或向右移动1．50-情况下，西格玛水平Z为3时，其特性落在规范限内的百分比是（）。
A、30.23%
B、69.13%
C、93.32%
D、99.379%
参考答案：C
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| I went back to China as soon as school was over at the end of June from Canada. It's 1 to go back to China this summer because of the A (H1N1) flu. Everybody seemed to be 2 . The easiest thing for us to do was to wear masks (口罩) on the plane, as my mom suggested. However, it was not 3 to wear a mask for ten hours. I decided to put the masks into my bag 4 wearing them. Everything seemed OK 5 the flight. I saw only five people wear masks all the time. When we arrived in Beijing, some 6 came into the plane and took our temperature. Fortunately, 7 had a fever. Therefore, I was able to get home on time. However, everything went wrong after I got home. I became sick, with a sore throat and a fever because I had not 8 my mom's words. Luckily, I just had a common 9 . While I was sick in bed, I thought that if I had listened to my mom at first, I 10 would have never caught the cold. It's always wise to listen to your mom's suggestions.
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