某资料服从正态分布,理论上在(-2.585,+2.58S)范围内的变量值个数占全部例 发布时间:2017-06-29 18:55 │ 来源:www.tikuol.com 题型:单项选择题 A1型题 问题: 某资料服从正态分布,理论上在(-2.585,+2.58S)范围内的变量值个数占全部例数的()A.95%B.97.5%C.98%D.99%E.99.5%
题型:单项选择题 A1型题 —I just won a free trip at the company dinner but I can't go because of heavy workload.—________! If anyone deserves to go on a trip, you do.[ ]A. Best wishes B. Never mindC. Believe it or not D. It's bad news 查看答案
题型:单项选择题 A1型题 In 1778, Bank was elected _________ president of the Royal Society, ________ position he held for 43 years.A.the; theB.不填; aC.a; aD.不填 ; the 查看答案
题型:单项选择题 A1型题 绕线转子异步电动机拖动恒转矩负载运行,当转子回路串入不同电阻,电动机转速不同。而串入电阻与未串电阻相比,对转子的电流和功率因数的影响是()。A.转子的电流大小和功率因数均不变B.转子的电流大小变化,功率因数不变C.转子的电流大小电流不变,功率因数变化D.转子的电流大小和功率因数均变化 查看答案