Which of the following RAID levels provides the BEST read and write performance？（）
单选题A technician is installing Windows XP on a system that has a SATA HDD. Which of the following will the technician MOST likely have to do to start the installation? （）A Press the F8 KeyB Press the F3 KeyC Press the F2 KeyD Press the F6 Key
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多选题Which two are valid declarations of a float？（）Afloat f = 1F；Bfloat f = 1.0.；Cfloat f = ‘1’；Dfloat f = “1”；Efloat f = 1.0d；
单选题Which of the following kdb commands is used to obtain a stack trace from a dump? （）Atrb Bhis Cf Dtrace
多选题class BaseClass{ private float x= 1.0f； protected void setVar （float f） {x = f；} } class SubClass extends BaseClass { private float x = 2.0f； //insert code here } Which two are valid examples of method overriding？（）AVoid setVar（float f） {x = f；}BPublic void setVar（int f） {x = f；}CPublic void setVar（float f） {x = f；}DPublic double setVar（float f） {x = f；}EPublic final void setVar（float f） {x = f；}FProtected float setVar（） {x=3.0f； return 3.0f； }
单选题Which of the following keystrokes allows installation of third party storage drivers during a Windows set-up？ （）AF6BF7CF8DF9
多选题Which two cause a compiler error？（）Afloat[] = new float（3）；Bfloat f2[] = new float[]；Cfloat[] f1 = new float[3]；Dfloat f3[] = new float[3]；Efloat f5[] = { 1.0f， 2.0f， 2.0f }；Ffloat f4[] = new float[] { 1.0f. 2.0f. 3.0f}；
单选题Given： Which code， inserted at line 16， will cause a java.lang.ClassCastException？（）AAlpha a = x；BFoo f = （Delta）x；CFoo f = （Alpha）x；DBeta b = （Beta）（Alpha）x；
