对于一张典型的正交表Ln(Pq)，以下说法错误的是______。
A．这说明用这张正交表安排实验的话，要做n个不同的试验
B．这张正交表有q列，用它安排实验的话最多可安排q个因子
C．这张表的主体有q个不同的数字
D．P代表因子水平编号，即用这张表安排实验时每个因子应取P个不同水平
参考答案：C
解析：
Ln(Pq)中，L是正交表代号，n是表的行数，p是因子水平编号，q是列数。
完形填空（共10小题，计10分） Once there was a king who told some of his people to dig a pond (池子).The king then told his people that one person 16 each family had to bring a glass of milk during the night and put it into the pond. So, by the morning, the pond should be 17 of milk. After 18 the order, everyone went home. As one man prepared his milk, he thought that since everyone was bringing milk, he would just 19 a glass of water and put that into the pond instead. 20 it was dark at night, no one would notice it, so he quickly went and put the water into the pond and 21 home. In the morning, the king went to visit the pond. To his 22 , the pond was only filled with water! What happened? Yes! Everyone had the same idea 23 that man. They all thought, “I don’t have to waste my milk. Someone else will do it.” Dear friends, when you plan to help poor people or people in trouble, do not think that 24 will take care of it. Instead, it starts with you. If you don’t do it, no one else will, so change yourself and make a 25 .
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