燃料和空气配比不当,燃料过多,燃烧不完全,会造成烟囱()。
A.冒小股黑烟
B.冒大股黑烟
C.冒黄烟
D.冒黑烟
参考答案:D
They say “____”, but there is every chance that Usian Bolt will strike again later this week, when he will try to break the 200 meters world record he set in Beijing.
A.A little knowledge is a dangerous thing
B.Lightning never strikes twice in the same place
C.Where there is a will, there is a way
D.Failure is the mother of success
没有附着在舌骨体上部或下部的肌肉是()
A.下颌舌骨肌
B.胸骨舌骨肌
C.肩胛舌骨肌
D.颏舌骨肌
E.二腹肌