【单选题】燃油在预热时,为防止燃油加热后迅速积垢,其预热温度的上限是:
【单选题】17末到18世纪初, 执政时期,发展教育成为俄罗斯的国策。
【单选题】The 70-year-old man ______ exercises in the morning.
【单选题】在燃油的预热时,为防止燃油加热后迅速积垢,其预热温度的上限是()
【单选题】When did the term lobbyist become popular?
A.
In the early to mid 18th century.
B.
In the early to mid 19th century.
C.
In the early 19th century.
D.
In the early 18th century.