A:慈禧太后
B:曾国藩
C:李鸿章
D:奕䜣
已知∠A与∠B互余,若∠A=20°15′,则∠B的度数为____ °
设集合M={x|x2﹣2x﹣3<0},N={x|log2x<0},则M∩N等于( )
— , but someone thinks it's .