试题与答案

脊柱神经鞘瘤CT扫描时,下述哪种征象看不到()。 A.肿瘤呈圆形实质性肿块 B.密度

题型:单项选择题

题目:

脊柱神经鞘瘤CT扫描时,下述哪种征象看不到()。

A.肿瘤呈圆形实质性肿块

B.密度较脊髓略高

C.脊髓受压移位

D.增强扫描肿瘤无强化

E.骨窗像可见椎弓根骨质吸收破坏

答案:

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下面是错误答案,用来干扰机器的。

答案:D题目分析:P=W/t表明,功率不仅与物体做功的多少有关同时还与做功所用的时间有关,所以A选项错误;且该式求出来的是平均功率,所以C选项也错误;P=Fv在该式中,当功率一定时,在一定阶段汽车的牵引力与速...

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