影响工作台阶坡面角确定的因素？
参考答案：
与矿岩性质、穿爆方式、推进方向、矿岩层理方向、节理发育程度等。
John received an invitation to dinner, and with his work______, he gladly accepted it. [ ]
A. finished
B. finishing
C. having finished
D. was finished
社会福利不属于社会保障的范畴。( )
