简述市场营销调研的一般要求。
参考答案:
—I’m going to attend your lecture at 9∶30 tomorrow morning.
—I regret to tell you that. When you arrive, it will have ended and I ________ questions with my students.
A.would discuss
B.will discuss
C.will be discussing
D.am discussing
普通钢材( )代替锅炉压力容器钢材。
A.不能 B.可以C.在一定条件下可以 D.不限制