A.5MPa B.10MPa C.15MPa D.20MPa
A.75 B.95 C.100 D.150
A.3D; B.14D; C.25D; D.28D。
A.70.7×70.7×70.7 B.100×100×100 C.150×150×150 D.200×200×200
A.10 B.20 C.30 D.40