在对总体参数的假设检验中,若给定显著性水平α(0﹤α﹤1),则犯第一类错误的概率是_________。
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二二走四的滑车组,其中表示钢丝绳的有效分支数为()根
A. 2
B. 3
C. 4
D. 6
We have learned that certain positive characteristics are helpful in language learning. Some people think that outgoing students are more successful language learners than introverted students. Do you agree? Are there any other characteristics that you think are helpful to language learning and why?