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【判断题】
实验法是按研究的目的控制或创造条件，对由此引起的或改变的被试心理活动进行研究的方法。()A.
正确
B.
错误
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举一反三
【单选题】According to the professor, what is the greatest advantage of hydroponics?
A.
The plants are less likely to develop soil-borne diseases.
B.
The cultivation requires much less labor than traditional methods.
C.
The water can be recycled in a hydroponic environment.
D.
Less space is needed to produce a large number of plants.
【简答题】What is the greatest positive integer x such that 2x is a factor of 1210?
【简答题】What is the Greatest Common Factor of 48 and 72?
【单选题】The sum of n different positive integers is less than 100. What is the greatest possible value of n?
A.
10
B.
11
C.
12
D.
13
E.
14