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
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
参考答案和解析
E
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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.
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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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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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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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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