掘进机使用的截齿形式分为()。
A.螺旋形
B.锥形
C.刀形
D.镐形
参考答案:C, D
– do you like Huo Zun’s “Roll of Bead Curtain(卷珠帘)”?
-- Very much. You know I love songs that both have great lyrics and beautiful music.
A.Why
B.How
C.When
D.What
试述装取料机在锻造生产中的优越性。