建筑物的投影图一般为正投影图。( )
参考答案：对
He asked me .
A．when she will come back
B．where would she go
C．how she did it
D．what to do it
磨内衬板一般采用（）。
A.生铁衬板
B.铸石衬板
C.合金生铁衬板
D.高锰钢衬板
