采掘工作面爆破必须执行（）
A.一炮三检制度
B.三人联锁放炮制度
C.开车不行人，行人不开车制度
参考答案：A, B
A worker is most likely to earn economic rent when the marginal revenue product (MRP) from her labor and the supply curve for her type of labor exhibit which of the following characteristics MRP Supply curve（）①A. High More elastic ②B. LowLess elastic ③C. High Less elastic
A. ①
B. ②
C. ③
装置停工过程中，常二线最后停的目的是什么？
