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产生2000个来beta分布beta(2,3)的样本,作频率直方图,分20个区间,并在直方图上添加beta(2,3)的密度曲线
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14 Alpha buys goods from Beta. At 30 June 2005 Beta’s account in Alpha’s records showed $5,700 owing to Beta.Beta submitted a statement to Alpha as at the same date showing a balance due of $5,200.Which of the following could account fully for the difference?A Alpha has sent a cheque to Beta for $500 which has not yet been received by Beta.B The credit side of Beta’s account in Alpha’s records has been undercast by $500.C An invoice for $250 from Beta has been treated in Alpha’s records as if it had been a credit note.D Beta has issued a credit note for $500 to Alpha which Alpha has not yet received.
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设有一共用体变量定义如下: union data { long w; float x; int y; char z;}; union data beta; 执行下列语句后,正确的共用体变量beta的值是( )。 beta.w=123456; beta.y=888; beta.x=3.1416; beta.z='x';A.123456B.888C.3.1416D.'X'
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已知符号定义语句如下: ALPHA EQU 100 BETA EQU 25 GAMMA EQU 2 分别求下列各表达式的值。 (1)ALPHA*4GTBETA (2)ALPHAMODGAMMA+BETA (3)(BETA/3)LE5 (4)ALPHAANDBETA (5)GAMMAXOR(BETAEQ25)
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下列哪些关于软件的说法是正确的?()A、软件的beta版本应当安装在在线服务器上B、软件的稳定版本应当安装在在线服务器上C、软件的beta版本应当安装在测试服务器上D、软件的beta版和稳定版都可以安装在测试服务器上
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A resource group, MY_APP, has the following configuration: Resource Group NameMY_APP Participating Node Name(s)Alpha Beta GammaStartup Policy Online On Home Node Only Fallover Policy Fallover To Next Priority Node In The List Fallback Policy Fallback To Higher Priority Node InThe List MY_APP is currently running on node Beta. MY_APP is then moved to node Gamma using C-SPOC.Nodes Alpha and Beta are shutdown and restarted. Node Alpha stabilizes approx 60 seconds before nodeBeta. What happens to the resource group, MY_APP, when nodes Alpha and Beta are restarted?()A、It moves to BetaB、It stays on GammaC、It moves to AlphaD、It moves to Alpha, then to Beta
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10. interface Foo {} 11. class Alpha implements Foo {} 12. class Beta extends Alpha {} 13. class Delta extends Beta { 14. public static void main( String[] args) { 15. Beta x = new Beta(); 16. // insert code here 17. } 18. } Which code, inserted at line 16, will cause a java.lang.ClassCastException?() A、 Alpha a = x;B、 Foo f= (Delta)x;C、 Foo f= (Alpha)x;D、 Beta b = (Beta)(Alpha)x;
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interface Beta {} class Alpha implements Beta { String testIt() { return “Tested”; } } public class Main1 { static Beta getIt() { return new Alpha(); } public static void main( String[] args ) { Beta b = getIt(); System.out.println( b.testIt() ); } } What is the result?() A、 TestedB、 Compilation fails.C、 The code runs with no output.D、 An exception is thrown at runtime.
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下列说法不正确的是: ()A、作直方图时,如何划分自变量的区间不是唯一确定的B、直方图没有丢失样本信息C、作直方图时自变量区间分得较少,有可能会掩盖了数据是双峰的信息D、作直方图时矩形的高低形状不同,能够造成视觉上的差异
考题
单选题下列说法不正确的是: ()A
作直方图时,如何划分自变量的区间不是唯一确定的B
直方图没有丢失样本信息C
作直方图时自变量区间分得较少,有可能会掩盖了数据是双峰的信息D
作直方图时矩形的高低形状不同,能够造成视觉上的差异
考题
单选题下列哪些关于软件的说法是正确的?()A
软件的beta版本应当安装在在线服务器上B
软件的稳定版本应当安装在在线服务器上C
软件的beta版本应当安装在测试服务器上D
软件的beta版和稳定版都可以安装在测试服务器上
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单选题A resource group, MY_APP, has the following configuration: Resource Group NameMY_APP Participating Node Name(s)Alpha Beta GammaStartup Policy Online On Home Node Only Fallover Policy Fallover To Next Priority Node In The List Fallback Policy Fallback To Higher Priority Node InThe List MY_APP is currently running on node Beta. MY_APP is then moved to node Gamma using C-SPOC.Nodes Alpha and Beta are shutdown and restarted. Node Alpha stabilizes approx 60 seconds before nodeBeta. What happens to the resource group, MY_APP, when nodes Alpha and Beta are restarted?()A
It moves to BetaB
It stays on GammaC
It moves to AlphaD
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单选题10. interface Foo {} 11. class Alpha implements Foo {} 12. class Beta extends Alpha {} 13. class Delta extends Beta { 14. public static void main( String[] args) { 15. Beta x = new Beta(); 16. // insert code here 17. } 18. } Which code, inserted at line 16, will cause a java.lang.ClassCastException?()A
Alpha a = x;B
Foo f= (Delta)x;C
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Beta b = (Beta)(Alpha)x;
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单选题interface Beta {} class Alpha implements Beta { String testIt() { return “Tested”; } } public class Main1 { static Beta getIt() { return new Alpha(); } public static void main( String[] args ) { Beta b = getIt(); System.out.println( b.testIt() ); } } What is the result?()A
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The code runs with no output.D
An exception is thrown at runtime.
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单选题1. class Alpha { void m1() {} } 2. class Beta extends Alpha { void m2() { } } 3. class Gamma extends Beta { } 4. 5. class GreekTest { 6. public static void main(String [] args) { 7. a Alpha [] a = {new Alpha(), new Beta(), new Gamma() }; 8. for(Alpha a2 : a) { 9. a2.m1(); 10. if (a2 instanceof Beta || a2 instanceof Gamma) 11. //insert code here 12. } 13. } 14. } 哪一行代码插入到第11行,将编译但是会在运行时产生异常?()A
a2.m2();B
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((Gamma)a2).m2();
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单选题Which code, inserted at line 16, will cause a java.lang.ClassCastException?()A
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Foo f=(Delta)x;C
Foo f=(Alpha)x;D
Beta b=(Beta)(Alpha)x;
考题
单选题Given: Which code, inserted at line 16, will cause a java.lang.ClassCastException?()A
Alpha a = x;B
Foo f = (Delta)x;C
Foo f = (Alpha)x;D
Beta b = (Beta)(Alpha)x;
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