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【简答题】
如图,以矩形ABCD的顶点A为,AD所在的直线为x轴,AB所在的直线为y轴,建立平面直角坐标系.点D的坐标为(8,0),点B的坐标为(0,6),点F在对角线AC上运动(点F不与点A、C重合),过点F分别作x轴、y轴的垂线,垂足为G、E.设四边形BCFE的面积为S 1 ,四边形CDGF的面积为S 2 ,△AFG的面积为S 3 . (1)试判断S 1 、S 2 ,的关系,并加以证明; (2)当S 3 :S 1 =1:3时,求点F的坐标; (3)如图,在(2)的条件下,把△AEF沿对角线AC所在直线平移,得到△A’E’F’,且A’、F’两点始终在直线AC上,是否存在这样的点E’,使点E’到x轴的距离与到y轴的距离比是5:4.若存在,请求出点E’的坐标;若不存在,请说明理由.
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举一反三
【单选题】The holding capability of an anchor is primarily determined by the _______.
A.
shape of the anchor
B.
stowage of the anchor on board
C.
anchor’s ability to dig in
D.
size of the vessel and her draft
【多选题】我国商品归类的依据有?
A.
《协调制度公约》
B.
《进出口税则》
C.
《商品及品目解释》
D.
《本国子目解释》
E.
海关总署下发的关于商品归类的行政裁定和商品归类决定
【单选题】The holding capability of an anchor is primarily determined by the().
A.
shape of the anchor
B.
stowage of the anchor on board
C.
anchor's ability to dig in
D.
size of the vessel and its draft
【简答题】我国进出口商品归类的依据有哪些?
【单选题】The holding capability of an anchor is primarily determined by the ______.
A.
Shape of the anchor
B.
Stowage of the anchor on board
C.
Anchor's ability to dig in
D.
Size of the vessel and its draft
【判断题】结晶性高聚物与结晶高聚物是相同的概念。(    )
A.
正确
B.
错误
【简答题】细菌的核糖体的沉降系数是 s
【判断题】结晶性高聚物与结晶高聚物是相同的概念。24. 结晶性高聚物与结晶高聚物是相同的概念。
A.
正确
B.
错误
【简答题】The capability of an inductor to store energy in a ______field is inductance
【单选题】____ is the capability of an airplane to respond to the pilot's control inputs.
A.
stability
B.
maneuverability
C.
controllability
D.
disturbility
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