不易淬火钢的焊接热影响区可分为：过热区正火区和（）。
参考答案：不完全重结晶区
电视连续剧中人物身份复杂，萧峰是契丹人、段誉是大理人、虚竹是大宋人，还有西夏公
辽
A B C D
Assume that output increased from 1550 to 1850 units per day as a result of increasing labor from 200 to 210 workers. The marginal product of labor is closest to:（）
A. 1.55 units per day per worker.
B. 30 units per day per worker.
C. 1.25 units per day per worker.
