单项选择题
A.≤5mm;≤5mm;≤4mm;≤15mm B.≤4mm;≤4mm;≤4mm;≤10mm C.≤4mm;≤4mm;≤4mm;≤15mm D.≤4mm;≤5mm;≤4mm;≤12mm
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