高岭土的组成可表示为Al2Si2Ox(OH)y,其中x、y的数值分别是 [ ]
A.7,2
B.5,4
C.6,3
D.3,6
答案:B
— Life now is not so easy as it ___________be, do you think so?
— Yes. I ___________ working seven days a week to get more pay.
A.used to; used to
B.was used to; used to
C.used to; am used to
D.was used to; am used to
与固定资产相比,营运资金的特点不包括()。
A.波动性
B.周转期短
C.占用稳定
D.灵活性