【简答题】如图,在△ ABC 中,点 D , E , F 分别是 AB , AC , BC 的中点, 若△ ABC 的周长为12cm,则△ DEF 的周长是 cm.
【简答题】如图,△ABC中,点D、E、F分别在三边上,E是AC的中点,AD、BE、CF交于一点G,BD=2DC,S △GEC =3,S △GDC =4,则△ABC的面积是______.
【单选题】Which of the following statements is correct in describing the size of Texas?
A.
Texas is the largest state in the US.
B.
Texas is the second largest state in the US.
C.
Texas ranks the forty-ninth in terms of the size.
D.
Texas is smaller than Alaska, but it is a little bigger than many other states in the US.
【简答题】如图,在△ABC中,点D、E、F分别为BC、AD、CE的中点,且S △ABC =16,则S △DEF =______.
【简答题】如图,在△ABC中,点E,F分别是AB,AC的中点且EF=1,则BC= .
【单选题】花岗石的放射性比活度,从高到低,依次为:
A.
红色>绿色>浅红色>灰白色> 黑色 > 白色
C.
红色> 浅红色> 绿色> 灰白色>白色>黑色
【简答题】如图,△ABC中,点D、E、F分别在三边上,E是AC的中点,AD、BE、CF交于一点G,BD=2DC,S △GEC =3,S △GDC =4,则△ABC的面积是( ).
【单选题】.如图,△ABC中,点D、E、F分别在三边上,E为AC中点,AD、BE、CF 交于一点BD=2DC,S△GEC=3,S△GDC=4,则△ABC的面积是( )
【单选题】患者男性,25岁,需留取粪便标本检查蛲虫,护士应告患者标本采集的时间为
【简答题】阅读理解 Three Central Texas men were honored with the Texas Department of Public Safety's Director's Award in a Tuesday morning ceremony for their heroism in saving the victims of a serious twocar accide...