若催化剂局部积炭,造成转化炉炉膛局部超温,应()。
A.关小火嘴阀
B.开大火嘴阀
C.提高负荷
D.消炭操作
参考答案:A, D
The professor ______ his voice to make himself ______.
A.rose; heard
B.rose; hearing
C.raised; heard
D.raised; hear
城市轨道交通对新从业人员安全生产教育培训时间不得少于()学时。
A.32
B.24
C.12
D.8