A.20℃±1℃
B.25℃±1℃
C.30℃±1℃
D.37℃±1℃

A.丁烷
B.乙炔
C.氫氣
D.天然氣

A.10s
B.20s
C.30s
D.40s

A.五號(hào)
B.五號(hào)黑體
C.四號(hào)
D.四號(hào)黑體

A.8
B.10
C.15
D.20