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【单选题】
300 Hurdles Now comes the first hurdle. __1__ We all make it over this hurdle with ease. This symbolizes. Those obstacles in life that we struggle to get over, but we always manage to do so. You can look at that hurdle in two ways: "I can’t make it over, I’m too tired" or "I am one more hurdle closer to finishing this race". This is an example of taking a negative situation and seeing something positive in it. The next part of the race is every hurdle between the first and last one. __2__ This happens a lot in life too. There may be a situation that arises where you feel as though you can’t make it and all you can think about is giving up. You may fall over that "hurdle" or struggle getting over it, but somehow you find it in yourself to jump over it and move on with the race. Next is that last 100m of the race. You feel as though you just want to say, "No I can't do this." __3__. Now lastly is the last hurdle. This hurdle is the toughest out of all of them. In life we find ourselves falling and falling, and maybe getting too lost in our problems that we fell like have been though enough and there’s no hope. __4__ It's one step close to the end of the race. Once you finish, you look back on it and you realize that you made it not by leaping, but step by step. "Yard by yard, life is very hard. But inch by inch, life can be a cinch."__5__. __2__内()
A.
This hurdle the easiest to get over because you are not worn out from running.
B.
Again, you must find it in yourself that you can do it, and you must finish the race stronger than when you had started it.
C.
All it takes is one step at a time, one hurdle at a time.
D.
That last hurdle symbolizes these situations.
E.
These hurdles get tougher and tougher and you may feel as though you can’t go on.
F.
Next is the lining up in our own individual lanes.
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【简答题】已知圆 ,坐标原点为O.圆C上任意一点A在x轴上的射影为点B,已知向量 . (1)求动点Q的轨迹E的方程; (2)当 时,设动点Q关于x轴的对称点为点P,直线PD交轨迹E于点F(异于P点),证明:直线QF与x轴交于定点,并求定点坐标.
【单选题】已知平面上直线l的方向向量 e = ,点O(0,0)和A(1,-2)在l上的射影分别是O′和A′,则 =λ e ,其中λ= [     ]
A.
B.
-
C.
2
D.
-2
【单选题】已知平面上直线 的方向向量 =( ),点 和 在 上的射影分别是 和 ,则 = ,其中 等于
A.
B.
-
C.
2
D.
-2
【简答题】已知向量 a =(2,3), b =(-4,7),则 a 在 b 方向上正射影的数量是______.
【单选题】已知平面上直线l的方向向量 = ,点O(0,0)和A(1,-2)在l上 的射影分别是O 1 和A 1 ,若 ,则λ=                (   )
A.
B.
C.
2
D.
-2
【简答题】已知圆C:x 2 +y 2 =4,点D(4,0),坐标原点为O.圆C上任意一点A在X轴上的影射为点B已知向量 OQ =t OA +(1-t) OB (t∈R,t≠0) (1)求动点Q的轨迹E的方程 (2)当t= 3 2 时,设动点Q关于X轴的对称点为点P,直线PD交轨迹E于点R (异于P点),试问:直线QR与X轴的交点是否为定点,若是定点,求出其坐标;若不是定点,请说明理由.
【判断题】填充剂具有增加制剂重量和体积,有利于制剂成型的作用。
A.
正确
B.
错误
【单选题】已知平面上直线l的方向向量 ,点O(0,0)和A(1,-2)在l上的射影分别是O 1 和A 1 ,则 ,其中λ= [     ]
A.
B.
-
C.
2
D.
-2
【多选题】下列简直属于北方派的剪纸是,
A.
扬州
B.
浙江
C.
河北
D.
山西
E.
陕西
【判断题】在关系数据库中,从关系中找出满足给定条件的元组,该操作可称为选择。
A.
正确
B.
错误
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