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【单选题】
在中世纪,西欧人的平均寿命是A.
不到50岁
B.
不超过60岁
C.
30岁
D.
70岁
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反馈参考答案：
举一反三
【简答题】一个标有“25V,2.5W”的白炽灯,正常工作时通过的电流为 ,电阻为 ,如果两端电压为20V,则电功率为 (电阻保持不变),如果两端电压为30V,可能造成的后果是 。
【单选题】有效的市场细分必须具备以下条件（ ）。
A.
市场要有同质性、应变性、市场范围较小等
B.
市场要有可进入性、可变性、垄断性、同质性等
C.
市场具有可测量性、需求大量性、效益性、应变性等
D.
市场具有差异性、可衡量性、可进入性、效益性等
【简答题】When I lived with my father, I _______ much knowledge _______ him. I never _________ such a thing. But ___________ tell me quickly what I have to do. This job has quite _________ me ______. I don't __...
【单选题】When I was a child，I lived with my mother，my father having been away to work in the town. I was then not (11)______ nine years old，lonely and expectant， (12)______ for things which I knew little about...
A.
yet
B.
however
C.
but
D.
nevertheless
【单选题】根据以下内容回答题： When l was a child，I lived with my mother，my father having been away to work in the town．1 was then not（1）nine years old，lonely and expectant，（2）for things which I knew little about．1 walke...
A.
yet
B.
however
C.
but
D.
nevertheless
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