主机由轻油换用重油时正确的程序是：
A、加热日用重油柜→加热器将轻油升温至40℃→接通重油→切断轻油→按要求升温A
暂无解析
已知，二次型的秩为2，(I)求实数a的值；(II)求正交变换x=Qy将f化为标准形.
Thelocaltextilemillhas800workers,_____700arewomen.
Afterhisuncledied，theyoungman_____thebeautifulestatewithwhichhechangedfromapoormantoawealthynoble．
Makesurethattransportationtoandfromtheriverisarrangedtoyour______.
Despitehavingreceivedpositivereviewsbyindustrycritics,salesofthedigitalMP3playerhavebeenquite_______(disappoint).
