计算向量场$A = \left( {{x^2} - y} \right)i + 4zj + {x^2}k$的旋度。 A: $4i+ 2xj - k$ B: $ - 4i - 2xj - k$ C: $ 4i +2xj + k$ D: $ - 4i - 2xj + k$
计算向量场$A = \left( {{x^2} - y} \right)i + 4zj + {x^2}k$的旋度。 A: $4i+ 2xj - k$ B: $ - 4i - 2xj - k$ C: $ 4i +2xj + k$ D: $ - 4i - 2xj + k$
流程图中的②应当填入: i<4|i>4|i≤4|i≥4
流程图中的②应当填入: i<4|i>4|i≤4|i≥4
【单选题】若i=4,则执行语句j=--i;后,i=____,j=____。 A. i=4,j=4; B. i=3,j=3; C. i=3,j=4; D. i=4,j=3;
【单选题】若i=4,则执行语句j=--i;后,i=____,j=____。 A. i=4,j=4; B. i=3,j=3; C. i=3,j=4; D. i=4,j=3;
Public Sub Proc(a%( )) Static i% Do a(i) = a(i) + a(i + 1) i = i + 1 Loop While i < 2 End Sub Private Sub Command1_Click( ) Dim m%, i%, x%(10) For i = 0 To 4: x(i) = i + 1: Next i For i = 1 To 2: Call Proc(x): Next i For i = 0 To 4: Print x(i);: Next i End Sub A: 3 4 7 5 6 B: 3 5 7 4 5 C: 2 3 4 4 5 D: 4 5 6 7 8
Public Sub Proc(a%( )) Static i% Do a(i) = a(i) + a(i + 1) i = i + 1 Loop While i < 2 End Sub Private Sub Command1_Click( ) Dim m%, i%, x%(10) For i = 0 To 4: x(i) = i + 1: Next i For i = 1 To 2: Call Proc(x): Next i For i = 0 To 4: Print x(i);: Next i End Sub A: 3 4 7 5 6 B: 3 5 7 4 5 C: 2 3 4 4 5 D: 4 5 6 7 8
若排列38i7j625为奇排列,则i=( ),j=( ). A: i=1,j=4 B: i=4,j=1 C: i=4,j=9 D: i=9,j=4
若排列38i7j625为奇排列,则i=( ),j=( ). A: i=1,j=4 B: i=4,j=1 C: i=4,j=9 D: i=9,j=4
以下程序的运行结果是 Sub s1(b() As Integer) For i = 1 To 4 b(i) = 2 * i Next i End Sub Private Sub Command1_Click() Dim a(1 To 4) As Integer For i = 1 To 4 a(i) = i + 5 Next i s1 a() For i = 1 To 4 Print a(i) Next i End Sub
以下程序的运行结果是 Sub s1(b() As Integer) For i = 1 To 4 b(i) = 2 * i Next i End Sub Private Sub Command1_Click() Dim a(1 To 4) As Integer For i = 1 To 4 a(i) = i + 5 Next i s1 a() For i = 1 To 4 Print a(i) Next i End Sub
若i=3,j=i++;执行运算后i和j的值为? A: i=3,j=4 B: i=4,j=4 C: i=4,j=3 D: i=3,j=3
若i=3,j=i++;执行运算后i和j的值为? A: i=3,j=4 B: i=4,j=4 C: i=4,j=3 D: i=3,j=3
【单选题】某多级减速器各级速比i 1 =2、i 2 =3、i 3 =4、i 4 =3,则总速比()。 A. i=i 1 +i 2 +i 3 +i 4 =12 B. i=i 1 ×i 2 ×i 3 ×i 4 =72 C. i=3(i 1 +i 2 +i 3 )=48 D. 不能求得
【单选题】某多级减速器各级速比i 1 =2、i 2 =3、i 3 =4、i 4 =3,则总速比()。 A. i=i 1 +i 2 +i 3 +i 4 =12 B. i=i 1 ×i 2 ×i 3 ×i 4 =72 C. i=3(i 1 +i 2 +i 3 )=48 D. 不能求得
某事故树的最小割集为:{x1},{x2,x3},{x2,x4,x5},则结构重要程度为()。 A: I(4)>;I(2)>;I(3)>;I(1)=I(5) B: I(1)>;I(2)>;I(3)>;I(4)=I(5) C: I(1)>;I(5)>;I(3)>;I(4)=I(2) D: I(5)>;I(3)>;I(2)>;I(1)=I(4)
某事故树的最小割集为:{x1},{x2,x3},{x2,x4,x5},则结构重要程度为()。 A: I(4)>;I(2)>;I(3)>;I(1)=I(5) B: I(1)>;I(2)>;I(3)>;I(4)=I(5) C: I(1)>;I(5)>;I(3)>;I(4)=I(2) D: I(5)>;I(3)>;I(2)>;I(1)=I(4)
下列程序执行后,其输出结果为( )。 Dim a(5) For i=0 To 4 a(i)=i+1 m=i+1 If m=3 Then a(m-1)=a(i-2)Else a(m)=a(i) If i=2 Then a(i-1)=a(m-3) a(4)=i Print a(i); Next i A: 1 1 1 4 4 B: 1 2 3 4 1 C: 1 2 1 4 4 D: 1 1 1 4 1
下列程序执行后,其输出结果为( )。 Dim a(5) For i=0 To 4 a(i)=i+1 m=i+1 If m=3 Then a(m-1)=a(i-2)Else a(m)=a(i) If i=2 Then a(i-1)=a(m-3) a(4)=i Print a(i); Next i A: 1 1 1 4 4 B: 1 2 3 4 1 C: 1 2 1 4 4 D: 1 1 1 4 1