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【单选题】
We were already _________to the airport when we realized we’d forgotten our passports.
A.
all the way
B.
by the way
C.
in the way
D.
on the way
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【简答题】平面束的方程A 1 x+B 1 y+C 1 z+D 1 +λ(A 2 x+B 2 y+C 2 z+D 2 )=0是否包含所有过直线 的平面.
【简答题】已知平面向量 a =( x 1 , y 1 ), b =( x 2 , y 2 ) ,若 | a |=2,| b |=3, a ? b =-6 ,则 x 1 + y 1 x 2 + y 2 =______.
【简答题】通过点(1,-1,1)作垂直于两平面x-y+z-1=0和2x+y+z+1=0的平面高等数学复旦大学出版第三版下册课后习题答案 通过点(1,-1,1)作垂直于两平面x-y+z-1=0和2x+y+z+1=0的平面.
【单选题】一平面通过两点M1(1,1,1),M2(0,1,-1),且垂直于平面x+y+z=0,则它的方程为( )。
A.
2x+y-z=0
B.
2x-y+z=0
C.
x-y-z=0
D.
2x-y-z=0
【单选题】— _____ — He is a bank clerk. [     ]
A.
Why does he like koalas?
B.
What does your father look like?
C.
Where is your father from?
D.
What does your father do?
【简答题】对于坐标平面内的任意两点P 1 (x 1 ,y 1 ),P 2 (x 2 ,y 2 ),定义运算“?”为:P 1 ?P 2 =(x 1 ,y 1 )?(x 2 ,y 2 )=(x 1 x 2 -y 1 y 2 ,x 1 y 2 +x 2 y 1 )若点M(x,y)(-2≤x≤-1),点N的坐标为(x,y)?(1,1),则点N到直线x+y+2=0距离的最大值为______.
【单选题】Why _____ he like dolphins? [     ]
A.
is
B.
are
C.
do
D.
does
【单选题】设集合A={(x,y)|x 2 +y 2 ≤1},集合B={(x,y)|log |x| |y|≤log |y| |x|,|x|<1,|y|<1},则在直角坐标平面内,A∩B所表示的平面区域的面积为 [     ]
A.
π
B.
C.
【单选题】Why does the man dislike living in the city?
A.
Because he like traveling.
B.
Because he does not like the house and neighbors in the city.
C.
Because he works near the country.
D.
Because he has a romantic attitude.
【单选题】Why _________ he like pandas?
A.
is
B.
are
C.
do
D.
does
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