【简答题】在速比一定的条件下,过小的中心距将使带传动的寿命下降,这是因为 _________________________________________________________________________________________________________________________________
【单选题】According to the article, why is it significant that buildings way have shops on the first (ground)floors with glass window displays?
A.
People like to shop on the ground floor of buildings.
B.
People can see into the windows on this level.
C.
Windows do not support a building as well as walls do.
D.
People should not shop in large buildings.
【简答题】La Luzerne Poil de Carotte et grand frère Félix (revenir) de vêpres et (se hâter) d'arriver à la maison, car c' (être) l'heure du goûter de quatre heures. Grand frère Félix aura une tartine de beurre ...
【单选题】下列关于预算的说法,不正确的是( )。
A.
全面预算体系由财务预算、专门决策预算和总预算组成
D.
预算是对目标的具体化,是将企业活动导向预定目标的有力工具
【单选题】Why are there still high buildings, or even skyscrapers in many cities?
A.
Because they are the symbol of modern time.
B.
Because many cities now lack building space.
C.
Because high buildings are an important financial source of a city's budget.
D.
Because high buildings represent the level of a country's science and technology.
【单选题】英国化学家戴维在实验室发现了“笑气”,其化学式是( )
【判断题】在苯环上引入第二个取代基时,第二个取代基引入苯环的位置和难易程度主要由苯环上原有的取代基来决定。 ( )