${\rm var}(X)=\,$ ${\bf E}[X]=\,$ ${\bf P}(X=3)=\,$ ${\bf P}(X=-2)=\,$ ${\bf P}(X=1)=\,$ ${\bf P}(X=0)=\,$______
${\rm var}(X)=\,$ ${\bf E}[X]=\,$ ${\bf P}(X=3)=\,$ ${\bf P}(X=-2)=\,$ ${\bf P}(X=1)=\,$ ${\bf P}(X=0)=\,$______
不符合八进制数是( ) A: 019 B: 0 C: 01 D: 067
不符合八进制数是( ) A: 019 B: 0 C: 01 D: 067
${\bf P}(X=-2)=\,$ ${\bf P}(X=1)=\,$ ${\bf P}(X=0)=\,$______
${\bf P}(X=-2)=\,$ ${\bf P}(X=1)=\,$ ${\bf P}(X=0)=\,$______
06210041:以下不正确的数组定义语句是( )。 A: double x[5]={2.0, 4.0, 6.0, 8.0, 10.0}; B: char ch1[ ]={'1', '2', '3', '4', '5'}; C: int y[5]={0, 1, 3, 5, 7, 9}; D: char ch2[ ]={'\x10', '\xa', '\x8'};
06210041:以下不正确的数组定义语句是( )。 A: double x[5]={2.0, 4.0, 6.0, 8.0, 10.0}; B: char ch1[ ]={'1', '2', '3', '4', '5'}; C: int y[5]={0, 1, 3, 5, 7, 9}; D: char ch2[ ]={'\x10', '\xa', '\x8'};
定义在(0,+∞)上的可导函数f(x)满足xf′(x)-f(x)<0,则对任意a,b∈(0,+∞)且a>b,有() A: af(a)>bf(b) B: bf(a)>af(b) C: af(a)<bf(b) D: bf(a)<af(b)
定义在(0,+∞)上的可导函数f(x)满足xf′(x)-f(x)<0,则对任意a,b∈(0,+∞)且a>b,有() A: af(a)>bf(b) B: bf(a)>af(b) C: af(a)<bf(b) D: bf(a)<af(b)
下面程序的输出结果是( )。L=[('b', 3), ('c', 1), ('d', 2), ('a', 5)]L.sort()print(L) A: {('a', 5), ('b', 3), ('c', 1), ('d', 2)} B: [('a', 5), ('b', 3), ('c', 1), ('d', 2)] C: [('c', 1), ('d', 2), ('b', 3), ('a', 5)] D: [('b', 3), ('c', 1), ('d', 2), ('a', 5)]
下面程序的输出结果是( )。L=[('b', 3), ('c', 1), ('d', 2), ('a', 5)]L.sort()print(L) A: {('a', 5), ('b', 3), ('c', 1), ('d', 2)} B: [('a', 5), ('b', 3), ('c', 1), ('d', 2)] C: [('c', 1), ('d', 2), ('b', 3), ('a', 5)] D: [('b', 3), ('c', 1), ('d', 2), ('a', 5)]
For the grade I or grade II public health events, which level CDC should be engaged? A: Prefecture CDC B: Provincial CDC C: National and provincial CDCs D: Prefecture and county CDCs E: County CDC
For the grade I or grade II public health events, which level CDC should be engaged? A: Prefecture CDC B: Provincial CDC C: National and provincial CDCs D: Prefecture and county CDCs E: County CDC
以口腔温度为标准,低热的范围是: A: 37~37. 2℃ B: 37. 3~38. 0℃ C: 38~38. 5℃ D: 38. 5~39℃ E: 39. 0-38. 5℃
以口腔温度为标准,低热的范围是: A: 37~37. 2℃ B: 37. 3~38. 0℃ C: 38~38. 5℃ D: 38. 5~39℃ E: 39. 0-38. 5℃
StringBuffer bf = new StringBuffer("0123456789");bf.insert(5, "abc");System.out.println(bf);//在控制台上输出。
StringBuffer bf = new StringBuffer("0123456789");bf.insert(5, "abc");System.out.println(bf);//在控制台上输出。
我国公共卫生体系中的疾病预防控制(CDC)包括 A: 国家CDC B: 省级CDC C: 地市级CDC D: 区县级CDC
我国公共卫生体系中的疾病预防控制(CDC)包括 A: 国家CDC B: 省级CDC C: 地市级CDC D: 区县级CDC