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【单选题】
汽车废气中主要有害物质包括( )
A.
S0 2 ,Nox
B.
CO,C0 2 ,四乙基铅,尘
C.
CO,NOx,烃类,铅化合物
D.
多环芳烃,飘尘
E.
重金属
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【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,△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 =______.
【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 forty-ninth in terms of size.
D.
Texas is smaller than Alaska, but it is a little bigger than many other states in the US.rr
【简答题】如图,在△ABC中,点E,F分别是AB,AC的中点且EF=1,则BC= .
【简答题】根据下列材料请回答 76~80 题: 材料一:2006年,我国劳动力供给总量快速增长,全年城镇需要安排就业总量约2500万人;从需求情况看,如果经济增长和就业弹性保持近年水平,2006年可增加就业岗位800万个左右,加上自然减员提供的就业岗位.2006年城镇可新增就业人员约1100万人。 材料二:困难地区、困难行业和困难群体的就业总量更为突出。2006年全国劳动力供给增量中,约有60%是 农村新增...
【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(   ) ­ 
A.
25­        
B.
30­       
C.
35­       
D.
40
【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...
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