方差与标准差
矿石中全铁35%,磁性率为42%,则氧化亚铁为()%。 ["14.7","12","83.3"]
import java.util.*; public class LetterASort { public static void main(String[] args) { ArrayList strings = new ArrayList(); strings.add(‟aAaA”); strings.add(”AaA”); strings.add(‟aAa”); strings.add(”AAaa”); Collections.sort(strings); for (String s: strings) { System.out.print(s + “ “); } } } What is the result?() [" Compilation fails."," aAaA aAa AAaa AaA"," AAaa AaA aAa aAaA"," AaA AAaa aAaA aAa"," aAa AaA aAaA AAaa"," An exception is thrown at runtime."]
双速风力发电机组普遍采用4极和6极发电机,且6极发电机的效率一般为4极的1/4到1/5,是因为() ["叶片失速后的功率变化","风速概率密度分布函数","小于25%额定功率时,发电机效率急剧下降","以上原因皆不对"]
编织学校
输移比