【判断题】一平面力系向 A 、 B 两点简化,结果相同,则主矢、主矩都不为零。
【单选题】According to the passage, which of the following statements is NOT true?
A.
It is not quite easy to tell how " rock and roll" began.
B.
Both the blues and country music were developed by the musicians in the southern United States.
C.
Both the Europeans and the African slaves came to America during the 17th century.
D.
It was the blues songs recorded in Memphis that made Elvis Presley popular throughout the nation.
【多选题】某平面力系向A、B两点简化的主矩为零,此力系的最终结果( )
【单选题】There is only one ticket. Either you or Mary ______ going to the cinema tomorrow.
【单选题】According to the text,which of the following stasement is NOT TRUE?
A.
It is not easy to tell how “ rock and roll ” began.
B.
Both the blues and country music were developed by the musicians in the southern United States.
C.
Both the Europeans and the African slaves came to America during the 17th century.
D.
It was the blues songs recorded in Memphis that made Elvis Presley popular throughout the world.