If [G,*] is a group, then * is() A: Satisfied combination law B: Have Unit element C: Every unit has inverse element D: Exchangeable

‌If [G,*] is a group, then * is()‌ A: Have identity element and can be combined B: Satisfy the law of Union and the law of exchange C: Have identity element and satisfy the law of exchange D: Have inverse, zero element

If [G,*] is a group, then * is() A: Have identity element and can be combined B: Satisfy the law of Union and the law of exchange C: Have identity element and satisfy the law of exchange D: Have inverse, zero element

利用DTD定义XML元素包含子元素，下面哪个选项（ ）的语法形式是正确的？ 未知类型：{'options': ['[!ELEMENT 父元素名 ]（子元素名1,子元素名2,…）[!ELEMENT 父元素名/]', '[!ELEMENT 父元素名 子元素名1,子元素名2,…]', '[!ELEMENT 父元素名 （子元素名1,子元素名2,…）]', '[!ELEMENT （子元素名1,子元素名2,…）父元素名 ]'], 'type': 102}

关于DTD定义元素的语法，下面哪个选项（ ）是正确的？ 未知类型：{'options': ['[ELEMENT 元素名称 元素内容的描述]', '[!ELEMENT 元素名称 元素内容的描述]', '[!DOCTYPE 元素名称 元素内容的描述]', '[DOCTYPE 元素名称 元素内容的描述]'], 'type': 102}

下列程序的输出是__________?publicclassTest{publicstaticvoidmain(String[]args){int[][]values={{3,4,5,1},{33,6,1,2}};intv=values[0][0];for(int[]list:values)for(intelement:list)if(v>element)v=element;System.out.print(v);}} A: 1 B: 3 C: 5 D: 6 E: 33

执行下列代码后，变量list2的值将改变为哪个选项？[br][/br] list1 = [1, 2, 3] list2 = [] for element in list1: list2.append(element) list1 = [4, 5, 6] A: [1, 2, 3] B: [4, 5, 6] C: [1, 2, 3, 4, 5, 6] D: 没有；该代码无效

A DC servo-motor is a type of ( ) applied to automatic control systems A: actuator B: amplifying element C: correcting element D: measuring element

If A is a matrix, the function max(A(:)) is ( ). A: to return the first element B: to return the maximum element in each row of the matrix C: to return the maximum element in each column of the matrix D: to return the largest element of the entire matrix

CSS中让元素隐藏，但是不清除元素的方法是（ ） A: element { display: none; } B: element { display: block;} C: element { visibility: visible; } D: element { visibility: hidden; }