计算题：已知六角螺母毛坏底面六边形的边长是12mm，高是12mm，内孔直径是10mm，试计算其质量？（ρ＝7.8g/cm³）

A.8×Φ10mm

B.10×Φ10mm

C.12×Φ12mm

D.16×Φ12mm

A.＜10mm

B.＜16mm

C.＜14mm

D.＜12mm

E.＜18mm

A.硬结直径≥12mm

B.硬结直径≥15mm

C.硬结直径≥10mm

D.红晕直径＞20mm

E.硬结直径＞20mm

A.6mm

B.8mm

C.10mm

D.12mm

A.8mm

B.10mm

C.12mm

D.14mm

A.长(81mm)×高(12mm)×厚(0.13mm)

B.长(80mm)×高(10mm)×厚(0.14mm)

C.长(79mm)×高(11mm)×厚(0.15mm)

D.长(80mm)×高(12mm)×厚(0.15mm)

A.8mm

B.10mm

C.12mm

D.14mm

A.2mm

B.10mm

C.8mm

D.12mm以上

E.5mm