A.18°~~22° B.10°~~20° C.10°~~15°
A.0.2~0.3 B.0.2~0.5 C.0.5~0.6
A.前倉(cāng)高、后倉(cāng)低 B.前倉(cāng)低、后倉(cāng)高 C.前后倉(cāng)的填充率一樣