已知向量OA→=(-2,0),OB→=(2,2),BC→=(2cosθ,2sinθ)(0 ≤θ<2π),则向量OA→与OC→的夹角的取值范围是( ).
(A)[7π/6 ,11π/6].
(B)[7π/12 ,11π/12].
(C)[2π/3 ,5π/3].
(D)[5π/4 ,7π/4].
第1题:
有以下程序
struct S{ int n; int a[20]; }; void f(int *a,int n) {int i; for(i=0;i a[i]+=i; } main() {int i; struct S s={10,{2,3,1,6,8,7,5,4,10,9}}; f(s.a, s.n); for(i=0;i printf(“%d”,s.a[i]); } 程序运行后的输出结果是( )。
A.2,4,3,9,12,12,11,11,18,9,
B.3,4,2,7,9,8,6,5,11,10,
C.2,3,1,6,8,7,5,4,10,9,
D.1,2,3,6,8,7,5,4,10,9,
第2题:
放宽检验一次抽样方案为( )。
A.(5,0)
B.(3,0)
C.(2,2
D.(2,0)
第3题:
有以下程序
struct S{ int n; int a[20]; };
void f(int *a,int n)
{ int i;
for(i=0;i<n-1;i++) a[i]+=i;
}
main( )
{ int i; struct S s={10,{2,3,1,6,8,7,5,4,10,9}};
f(s.a,s.n);
for(i=0;i<s.n;i++) printf("%d",s.a[i]);
}
程序运行后的输出结果是
A)2,4,3,9,12,12,11,11,18,9,
B)3,4,2,7,9,8,6,5,11,10,
C)2,3,1,6,8,7,5,4,10,9,
D)1,2,3,6,8,7,5,4,10,9,
第4题:
A.Justafterline5
B.Justafterline6
C.Justafterline7(thatis,asthemethodreturns)
D.Neverinthismethod.
第5题:
A、[4,6,9,13,17]
B、[3,4,5,6,7]
C、[3,4]
D、[3,6,11,17]
第6题:
计算:
(1) (-3)-(-7); (2)(-10)-3;
(3)33-(-27); (4)0 -12;
(5)(-11)-0; (6)(-4)-16。
(1)4; (2)-13;
(3)60; (4)-12;
(5)-11; (6)-20;
第7题:
计算:
(1)(-8)-(-1) (2)45+(-30)
(3)-1.5-(-11.5) (4)-1/4-(-1/2)
(5)15-[1-(-20-4)] (6)-40-28-(-19)+(-24)
(7)22.54+(-4.4)+(-12.54)+4.4
(8) (2/3-1/2)-(1/3-5/6)
(9)2.4-(-3/5)+(-3.1)+4/5 (10)(-6/13)+(-7/13)-(-2)
(11)3/4-(-11/6)+(-7/3)
(12)11+(-22)-3×(-11)
(13)(-0.1)÷1/2×(-100)
(14)(-3/4)×(-2/3 - 1/3) ×0
(15)(-2)3-32
(16)23÷[(-2)3-(-4)]
(17)(3/4-7/8)÷(-7/8)
(18)(-60)×(3/4+5/6)
(1)(-8)-(-1)=-7
(2)45+(-30)=15
(3)-1.5-(-11.5)=10
(4)-1/4-(-1/2)=1/4
(5)15-[1-(-20-4)]=-10 (6)-40-28-(-19)+(-24)=-73
(7)22.54+(-4.4)+(-12.54)+4.4=10
(8) (2/3-1/2)-(1/3-5/6)=-1
(9)2.4-(-3/5)+(-3.1)+4/5=0.7 (10)(-6/13)+(-7/13)-(-2)=1
(11)3/4-(-11/6)+(-7/3)=1/4
(12)11+(-22)-3×(-11)=22
(13)(-0.1) ÷1/2×(-100)=20
(14)(-3/4) ×(-2/3 - 1/3) ×0=0
(15)(-2)3-32=-17
(16)23÷[(-2)3-(-4)]=-23/4
(17)(3/4-7/8) ÷(-7/8)=1/7
(18)(-60) ×(3/4+5/6)=-95
第8题:
在○中填入“<”“>”“=”。
4/5-2/5○9/10-7/10 5/8-3/8○3/4-1/4
3/12+5/12○1/6+3/6 3/7+4/7○4/11+7/11
4/5-2/5>9/10-7/10 5/8-3/8<3/4-1/4
3/12+5/12=1/6+3/6 3/7+4/7=4/11+7/11
第9题:
A.Justafterline5.
B.Justafterline6.
C.Justafterline7.
D.Justafterline8(thatis,asthemethodreturns).
第10题:
有以下程序:
程序运行后的输出结果是( )。
A.2,3,1,6,8,7,5,4,10,9,
B.3,4,2,7,9,8,6,5,11,10,
C.2,4,3,9,12,12,11,11,18,9,
D.1,2,3,6,8,7,5,4,10,9,