△fHθm（ H+,aq, T ）= 0

下列物质中，ΔfHθm不等于0的是

阅读下列代码，输出结果正确的是()Vark=0;Vari=0;While(I<5){k＋＋;If(k>5){break;}}Document.write(I,k); A: 54 B: 45 C: 55 D: 44

标准麻花钻横刃处前角为（ ）。 A: -54°～-60° B: -10°～-20° C: 0° D: 5°

【单选题】A=[2,3,2,1;1,2,2,1; 1,2,3,-2]; A1=sum(A>A(2,1)); A(2,:)=[]; A2=A.^2-4; (6.6分) A. A1 =[1     3     3     0]; A2 =[0     5     0    -3;-3     0     5     0]; B. A1 =[1     3     -3     0]; A2 =[0     -5     0    -3;-3     0     5     0]; C. A1 =[-1     3     3     0]; A2 =[0     -5     0    -3;-3     0     5     0]; D. A1 =[-1     3     3     0]; A2 =[0     5     0    3;-3     0     5     0];

下列程序的运行结果是（ ）。t = 0 while t &lt; 5: print(t, " is less than 5") t = t + 1else: print(t, " is not less than 5") A: 0 is less than 51 is less than 52 is less than 53 is less than 54 is less than 55 is not less than 5 B: 1 is less than 52 is less than 53 is less than 54 is less than 55 is less than 55 is not less than 5 C: 0 is less than 51 is less than 52 is less than 53 is less than 54 is less than 5 D: 1 is less than 52 is less than 53 is less than 54 is less than 55 is less than 5

【单选题】Which of the following matrices does not have the same determinant of matrix B: [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -1, 0, -9,-5] A. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 0; -1, 0, -9, -5] B. [1, 3, 0, 2; -2, -5, 7, 4; 1, 0, 9, 5; -1, 0, -9, -5] C. [1, 3, 0, 2; -2, -5, 7, 4; 3, 5, 2, 1; -3, -5, -2, -1] D. [1, 3, 0, 2; -2, -5, 7, 4; 0, 0, 0, 1; -1, 0, -9, -5]

直接计算！4二0×5=480÷二0=30×7×二=449+98=45+408+55+9二=43×5×4=二5×36=360-90=二40÷45÷二=630÷48=40二×4二=45×44=705-498=39×9+39=4二5×3二=3二0+二60=6二0-450=430×7=360÷45=0÷54=

以下在定义一维数组a的同时，给a数组所有元素赋初值0，正确的语句是________。（ ） A: int a[5]={5*0 }; B: int a[5]={5,0}; C: int a[5]={0}; D: int a[5]=(0, 0, 0, 0, 0, 0);

以下在定义一维数组的同时，给数组所有元素赋初值，正确的语句是________。( ) A: int a[5]=(0, 0, 0, 0, 0, 0); B: int a[5]={5,0}; C: int a[5]={0}; D: int a[5]={5*0};