A.3000~4000 B.3500~4500 C.3500~4200 D.4500~6000
A.CO和CH4 B.O2和H2 C.H2和CH4 D.H2和CO
A.厚,長(zhǎng) B.寬,長(zhǎng) C.長(zhǎng),短 D.長(zhǎng),長(zhǎng)