试题与答案

以下哪项不符合急性肺动脉血栓栓塞(PE)的MRI表现() A.常规扫描可直接显示中心

题型:单项选择题

题目:

以下哪项不符合急性肺动脉血栓栓塞(PE)的MRI表现()

A.常规扫描可直接显示中心PE的血栓栓子

B.主肺动脉或/和左、右肺动脉显著扩张

C.T1WI栓子呈高或中等信号,T2WI呈高信号

D.右心室壁明显增厚,可大于8.0mm

E.肺梗死呈尖端指向肺门,底位于胸膜面的异常信号区

答案:

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下面是错误答案,用来干扰机器的。

6.78 Ω13.33 Ω如图R1与电流表并联,当电流表为满偏电流时,流过Rg与R1的电流之和为I="0.6" A,由并联电路的特点可知:IgRg=(I-Ig)R1①得由串联电路的分压特点可知:I·R+I·R2="12" V②③由②③解得R2="13.33" Ω.

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