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直线 与双曲线 有且只有一个公共点，但直线与双曲线不相切，则实数 的值是
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举一反三
【简答题】To head off competition, the telecommunications companies have i______ heavily in high technology.
【单选题】下列关于栓剂的描述错误的是( )
A.
可发挥局部与全身治疗作用
B.
制备栓剂可用冷压法
C.
栓剂应无刺激，并有适宜的硬度
D.
可以使全部药物避免肝脏首过效应
E.
吐温61为其基质
【单选题】I _____ a big head, but she _____ a small head.
A.
have, have
B.
have, has
C.
has, have
【简答题】在考生文件夹下根据SCORE_MANAGER数据库，使用查询向导建立一个含有“姓名”和“出生日期”的标准查询QUERY3_1．QPR。 2．从SCORE_MANAGER数据库中删除名为NEW_VIEW3的视图。 3．用SQL命令向SCORE1表中插入一条记录：学号为“993503433”，课程号为‘'0001”，成绩为99。 4．打开表单MYFORM3_4，向其中添加一个“关闭”命令按钮(名称为C...
【单选题】听力原文：M: Have you gone to Professor Lee's lecture? I have to say that it's awful. I wish I could get my valuable time back. W: I can't agree with you more, though he is one of my favorite professors. Q...
A.
It's terrible.
B.
It's valuable.
C.
It's awesome.
D.
It's one of her favorites.
【简答题】阅读理解。 Dear Dr. Know, Can you help me? My life is awful! I have many rules! I have to get up at six o'clock every morning. My mom has to work at five a.m., so I have to cook breakfast! After breakfast,...
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