单项选择题
A.原材、加工、焊接、尺寸 B.原材、加工、连接、安装 C.原材、加工、焊接、安装 D.原材、加工、焊接、外观
A.2/3 B.1/3 C.1/2 D.1/4
A.5d;75 B.10d;70 C.5d;70 D.10d;75