单项选择题
A.1张A2幅面图纸=2张A1幅面图纸 B.1张A4幅面图纸=2张A3幅面图纸 C.2张A2幅面图纸=1张A1幅面图纸 D.2张A1幅面图纸=1张A2幅面图纸
A.PP-R B.PE C.UPVC D.ABS
A.如有不妥 B.如无不妥 C.可否妥当 D.当否