据误差出现的规律，可以将误差分为（）。
A、系统误差
B、随机误差
C、粗大误差
D、人为误差
参考答案：A, B, C
— When will they leave?
— They _____ very soon. New term _____ on September 1st. [ ]
A. do leave; begins
B. are leaving; begins
C. have left; will begin
D. leave, is beginning
我国货币政策目标是：保持货币币值稳定，并以此促进经济增长。 ( )
