【单选题】Someday a stranger will read your e-mail without your permission or scan the Websites you've visited. Or perhaps someone will casually glance through your credit card purchases or cell phone bills to ...
A.
People's personal information is easily accessed without their knowledge.
B.
In the 21st century people try every means to look into others' secrets.
C.
People tend to be more frank with each other in the information age.
D.
Criminals are easily caught on the spot with advanced technology.
【单选题】细胞中的下列化合物中,哪项属于生物大分子
【简答题】以下程序的运行结果是______。 int x; main() { int a=5,b=8; swap(a,b) ; printf('a=%d,b=%d,x=%d/n',a,b,x); } swap(int a,int b) { int temp; temp=a;a=b; b=temp;x=a/b; printf('x=%d/n',x); }
【单选题】专门为客户提供公共关系专业服务的商业性机构是( )。
【单选题】二元函数f(x,y)=x^y分别对x与y的偏导数为
A.
y*x^(y-1); lnx*x^(y-1)
B.
y*x^(y-1); lny*x^(y-1)
【判断题】当代西方国家出现了许多私人开设的或半官半民的专业性决策研究机构,如美国的“兰德公司”,这种机构专门为政府提供决策方案,因而它也是一类行政机关。()
【简答题】函数f(x)=-x 3 +3x 2 ,设g(x)=6lnx-f′(x)(其中f′(x)为f(x)的导函数),若曲线y=g(x)在不同两点A(x 1 ,g(x 1 ))、B(x 2 ,g(x 2 ))处的切线互相平行,且 g( x 1 )+g( x 2 ) x 1 + x 2 ≥m 恒成立,求实数m的最大值.
【单选题】函数 y=lnx- 1 2 x 2 的导函数的零点为( )
【单选题】细胞中的下列化合物中,哪项属于生物大分子