煤、铁、石油资源丰富，钢铁、造船、机械工业发达的工业基地是[ ]
A．辽中南地区
B．京津唐地区
C．沪宁杭地区
D．珠江三角洲地区
答案：A
. —I have to get to the post office by six o’clock, but it is almost six now.
— . This clock is fifteen minutes fast.
A．That’s too bad
B．Sounds good
C．Sure, you can
D．Take it easy
粉碎机的筛片的包角形状和特点？
