山川凝浩气,物华启人文。
函数f(x)=(1+3tanx)cosx的最小正周期为( )
The company always________great importance to the quality of their products. That's why there is always steady increase in sales year by year.
2017年是内蒙古自治区成立70周年,下图为内蒙古自治区部分年份生产总值数据表(单位:亿元)。材料反映了( )