【判断题】【消耗次数：1】
有控制组的事先事后对比实验的调查方法的优点是能够测算实验误差，从而有助于提高实验结果的准确性。
①
正确
②
错误
参考答案：
复制
纠错
相关题目
【判断题】
事前事后对比实验方法的优点是实验组与控制组在同一时间内进行现场销售对比，不需要按时间顺序分为事前事后，这样可以排除由于实验时间不同而可能出现的外来变数影响。
①
正确
②
错误
【单选题】
下列对比实验中，（ ）是最简便的一种实验调查法的实验设计。
①
单一实验组前后对比实验
②
实验组与对照组对比实验
③
实验组与对照组前后对比实验
④
双实验组前后对比实验
随机题目
【单选题】
In the author’s opinion, if you cannot memorize all the new words you are learning, it is because _____.
①
you are forgetful
②
you are not working hard enough
③
you are not interested in memorizing English words
④
you are trying to memorize too many new words at a time
【单选题】
If you listen to the tape again and again, you may ____.
①
want to retell the general meaning of what you hear from the tape
②
feel so bored that you cannot understand what you hear from the tape
③
understand what you hear from the tape better and better
④
repeat the exact words you hear from the tape
【单选题】
Some handicapped people may be ______ to go out at all and a visitor is more than welcome.
①
able
②
unable
③
disable
④
disabled
【单选题】
In the eyes of the author, one should start from ______ in wide reading.
①
interesting materials
②
books with very few pages
③
materials not too difficult
④
both A and C