区组间的差异大,并不会增大试验误差,因此可通过统计分析扣除其影响。
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试验中某一因素的主效比另一因素的主效更为重要,而要求更精确的比较,宜采用裂区设计,其中将要求更高精确度的因素作为主处理。
A. 对
B. 错
Choose the best answer to each of the following questions according to Text B.Which of the following advantages of the Internet is not mentioned in Paragraph 1?
A. Watching movies.
Buying goods online.
C. Using online maps.
D. Communicating with friends.
When should we take a step back from the Internet?
A. When we prefer to shop and read news online.
B. When we tell others how much we like the Internet.
C. When we still think about the Internet when we are offline.