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WSN是一种以数据为中心的网络

2020-08-12 01:58:50 [优学院答案] 来源:超星题库网

For a profit-maximizing, competitive firm, the value of the marginal product of labor

  • equals the marginal product of labor divided by the wage rate
  • is the firm’s demand for labor.
  • All of the above are correct.
  • increases when the price of output decreases.

Government purchases are a measure of the dollar value of goods and services purchased indirectly by the government.

  • 错误
  • 正确

The financial system coordinates investment and saving, which are important determinants of long-run real GDP

  • 正确
  • 错误

National saving is equal to Y - T - C.

  • 正确
  • 错误

WSN是一种以数据为中心的网络

Public saving is equal to national saving minus private saving.

  • 正确
  • 错误

If, for an imaginary closed economy, investment amounts to $10,000 and the government is running a $2,500 deficit, then private saving must amount to $12,500.

  • 正确
  • 错误

Which of the following statements is correct? ( )

  • Savings deposits are included in both M1 and M2.
  • All items that are included in M1 are included also in M2.
  • All items that are included in M2 are included also in M1.
  • Credit cards are included in both M1 and M2.

The money supply in Muckland is $100 billion. Nominal GDP is $800 billion and real GDP is $400 billion. What are the price level and velocity in Muckland? ( )

  • The price level and velocity are both 4.
  • The price level is 2 and velocity is 8.
  • The price level and velocity are both 8.
  • The price level is 4 and velocity is 8.

Which of the following is not implied by the quantity equation? ( )

  • With constant money supply and velocity, an increase in output creates a proportional increase in the price level.
  • With constant money supply and output, an increase in velocity creates an increase in the price level.
  • If velocity is stable and money is neutral, an increase in the money supply creates a proportional increase in the price level.
  • If velocity is stable, an increase in the money supply creates a proportional increase in nominal output.

People can reduce the inflation tax by( )

  • reducing savings.
  • None of the above is correct.
  • increasing deductions on their income tax.
  • reducing cash holdings.

若x为int型变量,则执行语句:x=6; x+=x-=x*x后,x的值为

  • 24
  • 60
  • 36
  • -60

C程序中,运算对象必须为整型数据的运算符是

  • *

  • %

  • ++
  • /

C语言中合法的字符常量是

  • 011
  • "n"
  • '\n'
  • n

表达式 1/5+3%4+4.5/5的值是

  • 3.900000
  • 3.9
  • 1.10000
  • 1.85

WSN是一种以数据为中心的网络

以下不正确的转义字符是

  • '\0'
  • '\\'
  • '\'
  • '081'

设有说明:char w; int x; float y; double z; 则表 达式w*x+z-y值的数据类型为:

  • int
  • float
  • char
  • double

假设x、y、z为整型变量,且x=2,y=3,z=10,则下列表达式中值为1的是

  • x && y || z
  • x>z
  • (!x && y) || (y>z)
  • x && !z || !(y && z)

int x=1;while(x++<5);循环结束后,x的值是:

  • 7

  • 6

  • 5

  • 8

以下程序段的输出结果为()。for(i=4;i>1;i--)for(j=1;j<i;j++)putchar('#');

  • #

  • ######
  • ###
  • 无输出

下面程序的运行结果是#include<stdio.h> main() {int i,x,y; i=x=y=0; do {++i; if(i%2!=0) {x=x+i;i++;}y=y+i++; }while (i<=7);printf("x=%d,y=%d\n",x,y); }

  • x=2,y=21
  • x=1,y=21
  • x=1,y=20
  • x=2,y=20

int a=-1,b=4,k;k=(++a<0)&&!(b--<=0);printf(“%d%d%d\n”,k,a,b);的输出结果是

  • 004
  • 014
  • 005
  • 013

下列程序的输出结果是().main() {int x=1,y=0,a=0,b=0; switch(x){ case 1:switch(y) { case 0:a++;break; case 1:b++;break; } case 2:a++;b++;break; case 3:a++;b++;break; } printf("a=%d,b=%d\n",a,b); }

  • a=2,b=1
  • a=0,b=1
  • a=1,b=0
  • a=2,b=2

若有说明:int a[][3]={{1,2,3},{4,5},{6,7}}; 则数组a的第一维的大小为:

  • 5

  • 无确定值
  • 3

  • 4

对两个数组a和b进行如下初始化char a[]=”ABCDEF”; char b[]={‘A’,’B’,’C’,’D’,’E’,’F’};则以下叙述正确的是

  • a和b数组完全相同
  • a数组比b数组长度长
  • a和b长度相同
  • a和b中都存放字符串

若有以下数组说明,则i=10;a[a[i]]元素数值是int a[12]={1,4,7,10,2,5,8,11,3,6,9,12};

  • 9

  • 7

  • 6

  • 10

已知int a[3][4];则对数组元素引用正确的是

  • a(2)(1)
  • a[2][0]
  • a[1,3]
  • a[2][4]

设有以下说明语句:typedef struct stu{int a; float b;} stutype; 则下面叙述中错误的是

  • a和b都是结构成员名
  • struct是结构类型的关键字
  • struct stu是用户定义的结构类型
  • stutype是用户定义的结构体变量名

WSN是一种以数据为中心的网络

以下程序的正确运行结果是#include<stdio.h>main(){ int k=4,m=1,p; p=func(k,m);printf(“%d,”,p); p=func(k,m);printf(“%d\n”,p); } func(int a,int b) { static int m=0,i=2; i+=m+1; m=i+a+b; return(m); }

  • 8,8
  • 8,17
  • 8,20
  • 8,16

main() { int w=5;fun(w);printf("\n");}fun(int k) { if(k>O) fun(k-1);printf(" %d",k); }

  • 543210
  • 012345
  • 123450
  • 54321

以下函数值的类型是fun(float x){ float y; y=3*x-4; return y; 37 }

  • int
  • float
  • void
  • 不确定

以下程序的运行结果是: #include<stdio.h>void sub(int s[],int y){ static int t=3; y=s[t];t--; }main() {int a[]={1,2,3,4},i,x=0;for(i=0;i<4;i++){ sub(a,x);printf("%d",x);} printf("\n");}

  • 1234
  • 4444
  • 4321
  • 0000

在C语言中,当函数调用时

  • 可以由用户指定实参和形参是否共用存储单元
  • 实参和形参各占一个独立的存储单元
  • 实参和形参共用存储单元
  • 由系统自动确定实参和形参是否共用存储单元

理想流体是指

  • 忽略粘性作用的流体
  • 不考虑热传导性的流体
  • 考虑压缩性影响的流体
  • 密度为常量的流体

机翼上安装的可操纵翼面不包括

  • 后缘襟翼
  • 副翼
  • 升降舵
  • 前缘襟翼

飞机动力装置的主要作用是

  • 产生拉力或推力
  • 为飞机用电设备提供电源
  • 产生侧力
  • 产生升力

低速气流在同一流管中,流管收缩后将引起

  • 动压减小
  • 总压增大
  • 静压增大
  • 动压增大

随着迎角的变化,关于升力变化的规律描述错误的是

  • 超过临界迎角,气流绕流翼型会发生附面层分离
  • 升力系数综合表达了机翼形状、迎角等对飞机升力的影响
  • 升力系数随迎角增大始终呈线性增加
  • 在临界迎角,升力系数达到最大

在机翼上,阻力的方向

  • 垂直于翼弦方向
  • 平行于翼弦方向
  • 平行于相对气流方向
  • 垂直于相对气流方向

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