问题
选择题
They desired that they __________ the right to attend the meeting.[ ]
A. had
B. have
C. are
D. were
答案
答案：B
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They desired that they __________ the right to attend the meeting.[ ]
A. had
B. have
C. are
D. were
答案：B
，一条渐近线m：
，设过点A(-3
，0)的直线z的方向向量
．
]时，在双曲线C的右支上不存在点Q，使之到直线l的距离为[
]．