在城镇公路上发生交通事故后应立即停车,保护现场,开启危险报警闪光灯,并在来车方面50米至100米处设置警示标志。
参考答案:对
According to the newly-made traffic regulation, whoever drives through red light ________ be fined
at least 200 dollars. [ ]
A. shall
B. may
C. would
D. should
试论影响市场细分的因素的因素。