若x>y>1,a=(lgx+lgy),b=,c=lg,则( )A.c<b<a B.b<a<c C.b<c<a D.a<b<c
黄铁矿(主要成分为FeS2)是工业制取硫酸的重要原料,其煅烧产物为SO2和Fe3O4。 (1)将0.050molSO2(g)和0.030molO2(g)放入容积为1L的密闭容器中,反应:2SO2(g
下列说法中体现唯物主义和唯心主义根本分歧的是( ) A.“气者,理之依也”与“理生万物” B.“生死有命,富贵在天”与“物是观念的集合” C.“
Do you know your uneasy adolescent might be experiencing teen depression? Of course. Teen depression isn’t just bad moods and occasional sadness—it’s a serious problem that affects every aspec
已知向量,的方向与x轴的正方向的夹角是30°,则的坐标为_____________。
不等式所表示的平面区域的面积等于( ) A.1 B.2 C.4 D.8
In most towns today, you can see teenagers standing over electronic machines with flashing lights, shooting at spaceships from other planets and dropping bombs on strange monsters(恶魔).The mach