() of the A-frames there is a strong cast iron frame called the scavenging air box.
时间:2019-04-13 14:43:48 关键词:there,is,strong() of the A-frames there is a strong cast iron frame called the scavenging air box.
A.At the top
B.At the bottom
C.In the top
D.In the bottom
答案解析
A