下列材料中能够反映我国古代占据统治地位的经济政策的是
A:“夫工固圣王之所欲来,商又使其愿出于途者,盖皆本也”
B:“上农除末,黔首是富”
C:乡农卖丝争赴市,客船大贾米行商”
D:“世儒不察,以工商为末,妄抑议之”
若am=3,an=5,求a2m+3n和a3m﹣2n的值.
关于功率的下列说法中,正确的是( )
The fire was so damaging that the store had to close its doors.