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【简答题】
North Africans make up the largest and poorest________ group in the country.
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【简答题】在平面直角坐标系xOy中,曲线y=x -6x+1与坐标轴的交点都在圆C上. (Ⅰ)求圆C的方程; (Ⅱ)试判断是否存在斜率为1的直线,使其与圆C交于A, B两点,且OA⊥OB,若存在,求出该直线方程,若不存在,请说明理由.
【单选题】--- Jane, ________________________ --- A policeman.
A.
how is your brother?
B.
what does your brother do?
C.
where is your brother?
D.
how old is you brother?
【简答题】(坐标系与参数方程)在平面直角坐标系xOy中,点P的直角坐标为 (1,- 3 ) .若以原点O为极点,x轴正半轴为极轴建立极坐标系,则点P的极坐标可以是______.
【单选题】—____ ?   —He is tall and thin.
A.
What does your brother do
B.
Hoe old is your brother
C.
What does your brother look like
【判断题】晶体管特性曲线分成三个区域: 放大区 、 截止区 和 饱和区
A.
正确
B.
错误
【简答题】在平面直角坐标系xoy中,直线l的参数方程是 x= 3 + 1 2 t y=3+ 3 2 t (其中t为参数),以ox为极轴的极坐标系中,圆C的极坐标方程为ρ=cosθ,则圆心C到直线l的距离为______.
【单选题】坐标面xoy上的双曲线【图片】绕y轴旋转而成的曲面方程是( )
A.
椭球面
B.
双曲抛物面
C.
单叶双曲面
D.
双叶双曲面
【判断题】变量根据变量值连续出现与否,可分为离散变量和随机变量。()
A.
正确
B.
错误
【单选题】_______? ----He is very kind to us.
A.
What does your brother look like     
B.
How is your brother C What do you think of your brother    D. How much do you like your brother
【简答题】变量根据变量值连续出现与否,可分为()和()
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