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【简答题】
求曲线 再在点M(2，3)处的切线和法线方程．
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反馈参考答案：
举一反三
【单选题】Peter has ______ cough and he has to get ______ X-ray.
A.
an; a
B.
a; a
C.
a; an
D.
an; an
【单选题】He is ill. He has kept_____.
A.
coughing all along
B.
to cough at night
C.
cough since yesterday
D.
being coughed day and night
【简答题】Karen has to take cough syrup. How many should she take?A. One tablespoon each time B. Two tablespoons each time C. Three tablespoons each time
【简答题】根据 AECT94 的定义, 教育技术研究的对象 是 : 和 。
【单选题】Annie has a ________, and she is going to see her dentist today. A. cold B. fever C. cough D. toothache
A.
cold
B.
fever
C.
cough
D.
toothache
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