A:工业
B:农业
C:建筑业
D:博彩旅游业
门第不高的读书人可以凭才学参政始于( )
工业上制备铝的化学方程式为 2Al2O3= 4Al+3O2↑,则由102 g氧化铝制得铝的质量是多少?
—This history book is of great value.
—Exactly. _____ can be enjoyed from it ______ you have a deep understanding of it, however.