【简答题】Now if you subscribe fur one year, you can enjoy______.
【简答题】如图所示,在△ABC中,I为△ABC的内心,AI交BC于D,交△ABC外接圆于E. 求证:(1)IE=EC; (2)IE 2 =ED·EA.
【简答题】如图,EF是△ABC的中位线,BD平分∠ABC交EF于D,若BE=2,DF=1,则BC=( )。
【单选题】拟用气相色谱法测定含氯农药六六六,选用下列哪种检测器较好:
【简答题】如图,在△ABC中,AD⊥BC于D,BE⊥AC于E, AD交BE于F. (1)求证:△ADC∽△BEC; (2)若S △ABC =9,S △DCE =1,求sin∠DAC的值.
【简答题】What is the benefit if you get cash from Cashplus?You can enjoy a______.
【单选题】2对于字典d={'abc':1, 'qwe':2, 'zxc':3},len(d)的结果为: