北京国际汽车展每()年一届。 ["A、一年","B、两年","C、三年","D、半年"]
脑血管狭窄的TCD表现是() ["狭窄段血流速度增快","狭窄远端血流速度减低","流速曲线图形异常(充填)","血管杂音","以上均是"]
TCD常规探测大脑动脉血流信号,下列选项为血流背离探头(负向流速曲线): ①椎一基底动脉; ②大脑中动脉; ③大脑前动脉; ④大脑后动脉() ["①②③","①③","②④","④","①②③④"]
我国最大的天然渔港是哪个?
超声诊断睾丸扭转的主要依据是() ["睾丸肿大","睾丸内出现异常暗区","睾丸内无血流信号或血流信号减少","精索呈麻花征","睾丸鞘膜积液"]
胆囊炎、胆石症可出现()或()部位的放射痛。