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问题 选择题

棱柱的侧棱

A．相交于一点

B．平行但不相等

C．平行且相等

D．可能平行也可能相交于一点

答案

答案：C

棱柱的侧面是平行四边形；侧棱是相邻的侧面的公共边，所以侧棱平行且相等.故选C

改错题

Nowadays, some students would not like to live in a dormitory. Instead, they rented houses outside the school. There are advantages for them all. Living in a dormitory can increase friendship and cooperation among classmates, but of course it is safer．Besides, a dormitory is more like a society, where enables students to learn to get along with the each other，thus preparing the social life later. As for renting houses to live lonely, it’s better for your study as you can feel freely in your own room without being interrupted by others. As a result，you can have a plenty of time to devote yourself to review your lessons wholeheartedly. But there may appear a few safety problem as you live outside the school. Anyhow as a student, I prefer living in a dormitory.
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多项选择题

女性，34岁，自诉1个月前被咽喉部被鱼刺刺伤，近半个月发热，咽喉部疼痛，CT检查如图所示，请选择正确的描述和结论（）。

 

A.左侧咽后壁可见低密度肿块影

B.肿块内密度均匀

C.考虑咽后壁脓肿

D.考虑神经源性肿瘤

E.考虑血管瘤
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