如果想对一个div块元素的宽度属性设置一个2s的过渡效果,相应的CSS属性应该如何写()。 A: animation:width2s; B: transition:width2s; C: transition:2swidth; D: transition:divwidth2s;

void area( int length, int width ){ int s; s= length * width ; printf(“长%d，宽%d的长方形面积是%d ”, length , width ，s);}有如上求长方形面积函数，正确的调用方法是（ ）。提示：本题area是无返回值的函数。 A: c=area(1,2); B: area(1,2); C: area( ); D: c=area( );

int area( int length, int width ){ int s; s= length * width ; return s;}有如上求长方形面积函数，正确的调用方法是（ ）。提示：本题area是有返回值的函数。 A: c=area(1,2); B: area(1); C: c=area("12","34" ); D: area( );

Consider a c-Si solar cell whose fingers have a resistance R=0.1Ω. What would be the finger's resistance (in Ω) if the finger's width is doubled and the finger's height is one third of its initial value?______

【单选题】曲线 r(s)={cos(√2s/2),sin(√2s/2),√2s/2} 在s=0 的近似曲线为 (2.0分) A. R(s)={s,s^2/2,s^3/6} B. R(s)={s,s^2/4,s^3/24} C. R(s)={s,s^2/3,s^3/6} D. R(s)={s,s^2/3,s^3/24}

给定字符串s = '0a1b2c3d4e5f6g',以下能得到'6543210'的是: A: s[-2::2] B: s[-2:0:2] C: s[-2::-2] D: s[:]

39号元素钇的核外电子排布式是下列排布中的（ ） A: 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 2 4 p 6 4 d 1 5 s 2 B: 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 2 4 p 6 5 s 2 5 p 1 C: 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 2 4 p 6 4 d 2 5 s 1 D: 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 2 4 p 6 5 s 2 5 p 1

What property did Archimedes need to determine in order to solve the king's mystery? A: The width of the king's head B: The weight of silver C: The density of the crown D: The cost of the crown

【多选题】已知代码如下 class Rectangle { private int width, height; public void setSize(int width, int height) { this.width = width; this.height = height; } } 下面哪些代码重载 setSize 方法 (10.0分) A. protected void setSize(int width, int height) { this(width, height) } B. public void setSize(int width, float height) { this.width = width; this.height = (int)height; } C. protected void setSize(int width) { this.width = width; } D. public void setSize(int height, int width) { this.width = width; this.height = height; }

设n维向量组α1，α2，…，αs(s＜n)线性无关，则β1，β2，…，βs线性无关的充分必要条件是 A: α1，α2，…，αs可由β1，β2，…，βs线性表出． B: β1，β2，…，βs可由α1，α2，…，αs线性表出． C: α1，α2，…，αs与β1，β2，…，βs等价． D: 矩阵A=(α1，α2，…，αs)与矩阵B=(β1，β2，…，βs)等价．