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【单选题】
已知直线l过点（-2，0），当直线l与圆x 2 +y 2 =2x有两个交点时，其斜率k的取值范围是 [ ]A.
(-2 ，2 )
B.
(- ， )
C.
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反馈参考答案：
举一反三
【单选题】关于一般凸集下列哪种说法是正确
A.
凸集中一定包含有限个点
B.
凸集中可能存在两个点，其连线段的中点不在凸集中。
C.
任意凸集的顶点个数一定是有限个
D.
凸集的顶点个数有可能是无穷多个
【单选题】听力原文：W: During the last thunder storm, I noticed several leaks in my bedroom ceiling and they really caused a mess. M: Maybe you have some broken tiles. I have the phone number of a good roofing compa...
A.
The roof of the woman's house needs to be repaired.
B.
The roof of the man's house has several bad leaks.
C.
The woman's bathroom was badly damaged.
D.
The man works for a roofing company.
【单选题】听力原文：W: During the last thunder storm, I noticed several leaks in my living room ceiling. M: Maybe you have some broken shingles. I have the number of a good roofing company. Q: What can we conclude f...
A.
The woman is afraid of thunderstorms.
B.
The man works for a roofing company.
C.
The roof of the woman's house needs repairing.
D.
The man's roof is leaking.
【单选题】粒细胞缺乏症是指外周血中性粒细胞绝对值为（）
A.
0
B.
＜0.3×10 9 /L
C.
＜0.5×10 9 /L
D.
＜0.8×10 9 /L
E.
＜1.0×10 9 /L
【简答题】洛必达(LHospital)法则 若f(z)及g(z)在点z0解析，且 f(z0)=g(z0)=0，g(z0)≠0， 则(试证)
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