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【单选题】
The water is too hot. We’d better right now.
A.
not to drink
B.
don’ t drink
C.
not drink
D.
drink not
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皮皮学刷刷变学霸
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【单选题】设L是直线x=0上(0,-1)与(0,0)之间的一段,则 的值为
A.
1
B.
1/2
C.
-1
D.
-1/2
查看完整题目与答案
【简答题】在平面直角坐标系xoy中,设点F(1,0),直线l:x=-1,点P在直线l上移动,R是线段PF与y轴的交点,RQ⊥FP,PQ⊥l. (1)求动点Q的轨迹的方程; (2)记Q的轨迹的方程为E,过点F作两条互相垂直的曲线E的弦AB、CD,设AB、CD的中点分别为M,N.求证:直线MN必过定点R(3,0).
查看完整题目与答案
【单选题】______ we have the official list of participants, we can make the final arrangements accordingly.
A.
Until
B.
Even though
C.
Now that
D.
Unless
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【简答题】设P(a,b)(b≠0)是平面直角坐标系xOy中的点,l是经过原点与点(1,b)的直线,记Q是直线l与抛物线x 2 =2py(p≠0)的异于原点的交点, (1)若a=1,b=2,p=2,求点Q的坐标; (2)若点P(a,b)(ab≠0)在椭圆 +y 2 =1上,p= ,求证:点Q落在双曲线4x 2 -4y 2 =1上; (3)若动点P(a,b)满足ab≠0,p= ,若点Q始终落在一条关于x轴对称的...
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【简答题】设P( a , b )( b ≠0)是平面直角坐标系 x O y 中的点, l 是经过原点与点(1, b )的直线,记Q是直线 l 与抛物线 x 2 =2 py ( p ≠0)的异于原点的交点 ⑴.已知 a =1, b =2, p =2,求点Q的坐标。 ⑵.已知点P( a , b )( ab ≠0)在椭圆+ y 2 =1上, p =,求证:点Q落在双曲线4 x 2 -4 y 2 =1上。 ⑶.已知...
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【简答题】设P(a,b)(b≠0)是平面直角坐标系xOy中的点,l是经过原点与点(1,b)的直线,记Q是直线l与抛物线x 2 =2py(p≠0)的异于原点的交点 (1)若a=1,b=2,p=2,求点Q的坐标 (2)若点P(a,b)(ab≠0)在椭圆 x 2 4 +y 2 =1上,p= 1 2ab , 求证:点Q落在双曲线4x 2 -4y 2 =1上 (3)若动点P(a,b)满足ab≠0,p= 1 2ab ,...
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【简答题】We ______(应该始终牢记) that we have the responsibility to make the world a better place to live in.
查看完整题目与答案
【单选题】肺泡表面活性物质
A.
由肺泡Ⅰ型细胞分泌
B.
增加 肺泡表面张力
C.
主要成分是二硬脂酰卵磷脂
D.
增加 肺的顺应性
E.
分布于肺泡上皮细胞与表面液体层之间
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【单选题】We are unable to extend the gear we have to make a belly landing.
A.
We can not crank the landing gear down request a forced landing.
B.
We can not put the gear down so we will make a low pass before landing.
C.
We decided to make an urgency landing due complete hydraulic failure.
D.
We must make a gear up landing due to undercarriage extension problem.
查看完整题目与答案
【单选题】We have only a few hours so we must ______ our time.
A.
grasp
B.
take
C.
make the most of
D.
make use of
查看完整题目与答案
相关题目:
【单选题】设L是直线x=0上(0,-1)与(0,0)之间的一段,则 的值为
A.
1
B.
1/2
C.
-1
D.
-1/2
查看完整题目与答案
【简答题】在平面直角坐标系xoy中,设点F(1,0),直线l:x=-1,点P在直线l上移动,R是线段PF与y轴的交点,RQ⊥FP,PQ⊥l. (1)求动点Q的轨迹的方程; (2)记Q的轨迹的方程为E,过点F作两条互相垂直的曲线E的弦AB、CD,设AB、CD的中点分别为M,N.求证:直线MN必过定点R(3,0).
查看完整题目与答案
【单选题】______ we have the official list of participants, we can make the final arrangements accordingly.
A.
Until
B.
Even though
C.
Now that
D.
Unless
查看完整题目与答案
【简答题】设P(a,b)(b≠0)是平面直角坐标系xOy中的点,l是经过原点与点(1,b)的直线,记Q是直线l与抛物线x 2 =2py(p≠0)的异于原点的交点, (1)若a=1,b=2,p=2,求点Q的坐标; (2)若点P(a,b)(ab≠0)在椭圆 +y 2 =1上,p= ,求证:点Q落在双曲线4x 2 -4y 2 =1上; (3)若动点P(a,b)满足ab≠0,p= ,若点Q始终落在一条关于x轴对称的...
查看完整题目与答案
【简答题】设P( a , b )( b ≠0)是平面直角坐标系 x O y 中的点, l 是经过原点与点(1, b )的直线,记Q是直线 l 与抛物线 x 2 =2 py ( p ≠0)的异于原点的交点 ⑴.已知 a =1, b =2, p =2,求点Q的坐标。 ⑵.已知点P( a , b )( ab ≠0)在椭圆+ y 2 =1上, p =,求证:点Q落在双曲线4 x 2 -4 y 2 =1上。 ⑶.已知...
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【简答题】设P(a,b)(b≠0)是平面直角坐标系xOy中的点,l是经过原点与点(1,b)的直线,记Q是直线l与抛物线x 2 =2py(p≠0)的异于原点的交点 (1)若a=1,b=2,p=2,求点Q的坐标 (2)若点P(a,b)(ab≠0)在椭圆 x 2 4 +y 2 =1上,p= 1 2ab , 求证:点Q落在双曲线4x 2 -4y 2 =1上 (3)若动点P(a,b)满足ab≠0,p= 1 2ab ,...
查看完整题目与答案
【简答题】We ______(应该始终牢记) that we have the responsibility to make the world a better place to live in.
查看完整题目与答案
【单选题】肺泡表面活性物质
A.
由肺泡Ⅰ型细胞分泌
B.
增加 肺泡表面张力
C.
主要成分是二硬脂酰卵磷脂
D.
增加 肺的顺应性
E.
分布于肺泡上皮细胞与表面液体层之间
查看完整题目与答案
【单选题】We are unable to extend the gear we have to make a belly landing.
A.
We can not crank the landing gear down request a forced landing.
B.
We can not put the gear down so we will make a low pass before landing.
C.
We decided to make an urgency landing due complete hydraulic failure.
D.
We must make a gear up landing due to undercarriage extension problem.
查看完整题目与答案
【单选题】We have only a few hours so we must ______ our time.
A.
grasp
B.
take
C.
make the most of
D.
make use of
查看完整题目与答案