A.19.175%
B.44.1%
C.2.25%
D.0.165%

A.關(guān)閉
B.打開
C.適當(dāng)開度

A.7
B.8
C.9
D.10

A.16Mn
B.24Mn
C.65Mn
D.70Mn

A.六層
B.八層
C.頂部