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A magnetic strainer is used in the diesel engine reduction gear oil system to remove small particles of
A.water
B.babbitt
C.iron or steel
D.acids
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importjava.util.*；classKeyMaster{publicinti；publicKeyMaster（inti）{this.i=i；}publicbooleanequals（Objecto）{returni==（（KeyMaster）o）.i；}publicinthashCode（）{returni；}}publicclassMapIt{publicstaticvoidmain（String[]args）{Setset=newHashSet（）；KeyMasterk1=newKeyMaster（1）；KeyMasterk2=newKeyMaster（2）；set.add（k1）；set.add（k1）；set.add（k2）；set.add（k2）；System.out.print（set.size（）+：”）；k2.i=1；System.out.print（set.size（）+：”）；set.remove（k1）；System.out.print（set.size（）+：”）；set.remove（k2）；System.out.print（set.size（））；}}Whatistheresult？（）
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CompanycomwantstoapplyaPTFtothep5590system.Afterdoingapreviewinstall,theoutputshowsthereisinsufficientspaceinthe/usrfilesystem.Therootvolumegrouphasnoavailablephysicalpartitionsleft.Theydonotwanttoaddadditionaldiskdrivestothesystem,buthaveajfs2filesystemthatisonly8%used.Whatcouldtheydotoutilizespaceinthejfs2filesystemtoapplythisPTF?（）A.BackupthefilesystemandrecreatesmallerB.UsethechfstoreducethefilesystemsizeC.UsecplvtocopyfilesystemtosmallersizeD.Usemigratepvtocopyfilesystemtosmallersize
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阅读以下说明和Java程序，将应填入(n)处的字句写在对应栏内。[说明]下面程序输出一个矩形面积，以及矩形区域上的假想的作物产量。[Java程序]public class MainJava {public static void main(String[] args){Lot_size small=new Lot_size();Lot_size medium=new Lot_size();small.set(5,5,5，25);medium.set(10,10,10,50);System.out.println("For a small lot of area"+small.get_area()+"\n");System.out.println("the actual crops are $"+small.get_data2()+"\n");System.out.println("and ideal crops are $"+small.get data()+"\n");System.out.println("For a medium lot of area"+medium.get_area()+“\n”)；System.out.println("the actual crops are $"+medium.get_data2()+"\n");System.out.println ("and ideal crops are $"+medium.get_data()+"\n");}}class Crop_assessment{private int actual_crop;private int ideal_crop;public void set(int in_actual,int in ideal){actual_crop=in_actual;ideal_crop=in_ideal;}public int get_actual_crop(){return (1) ;}public int get_ideal_crop()(return (2) ;}}class Lot_size{private int length;private int width;private Crop_assessment crop= (3) ;public void set(int 1,int W,int a,int i){length=1;width=W;crop.set(a,i);}public int get_area(){return length*width;}public int get_data()freturn (4) ;}public int get_data2()(return (5) ;}}
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2、下面能正确显示水分子表达式的选项为（）。A．H＜sub＞2＜/sub＞OB．H＜small＞2＜/small＞OC．H＜small＞＜sup＞2＜/sup＞＜/small＞OD．H＜small＞＜sub＞2＜/sub＞＜/small＞O
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下面能正确显示水分子表达式的选项为（）。A．H＜sub＞2＜/sub＞OB．H＜small＞2＜/small＞OC．H＜small＞＜sup＞2＜/sup＞＜/small＞OD．H＜small＞＜sub＞2＜/sub＞＜/small＞O
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os的下列函数中，用来给文件重命名的是？A．rename()B．remove()C．listdir()D．system()
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