脱泥作业一般分（）作业。
A、块煤脱泥
B、末煤脱泥
C、筛分脱泥
D、浓缩脱泥
参考答案：A, B
I was told that 10:15 flight would take us to Shanghai in time to reach Fudan University.
A．the; /
B．the; a
C．a; the
D．/; the
可采取单面焊与双面焊形式的焊接方法有（）
A.帮条焊
B.搭接焊
C.坡口焊
D.气压焊
