市场专业化策略指企业集中资源生产一种产品提供给所有顾客。
参考答案：错
—Didn't you enjoy yourself at the party?
—_____, there was _____ at the party. [ ]
A. Yes, interesting nothing
B. Yes, nothing interesting
C. No, interesting nothing
D. No, nothing interesting
混凝土细骨料质量要求，含泥量（黏、粉粒）应小于（）。
A.1％
B.2％
C.3％
D.5％
