【简答题】信号设备应符合“ ( )”原则,当信号设备发生故障时,信号机应能自动地给出最大限制的信号显示。
【多选题】How to compare if two strings are equal? String str1=new String("There is a dog"); Scanner sc=new Scanner(System.in); String str2=sc.nextLine();
A.
if(str1==str2) //do something
B.
if(str1.equals(str2)) //do something
C.
if(str2==str1) //do something
D.
if(str2.equals(str1)) //do something
【单选题】当一个信号设备有故障时,此时需要____。
【简答题】在Java中,语句String str =“abcdefg”;str = str.substring(1,3);执行后str中的值为______。If there were statements are String str =“abcdefg”;str = str.substring(1,3);the result of str after running will be ______.
【单选题】下列各运算中,错误的个数是( ) ①3 0 +3 -1 =-3;② 5 - 2 = 3 ;③(2a 2 ) 3 =8a 5 ;④-a 8 ÷a 4 =-a 4
【判断题】弗洛伊德始终认为,在人的精神活动中,"凡是精神方面的东西,首先是潜意识的;而另外一种性质--'意识'则可能存在,可能不存在。”
【单选题】当一次设备发生故障时,继电保护能将故障部分迅速切除,并发出信号,以保证( )安全可靠、经济合理地运行。
【简答题】For a binary tree with at least one node, if there are n nodes with degree 0 and m nodes with degree 2, then n = ________ ( This problem is judged by string matching, Please make sure your answer don'...