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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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【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
【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).
【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
【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...
【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...
【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 ,...
【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.
【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
【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.
【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
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