问题 单项选择题

多普勒超声的描述下列哪一项是错误的

A.主要分为连续波和脉冲波多普勒
B.脉冲波多普勒具有距离选通性
C.连续波多普勒不具有距离选通性
D.脉冲多普勒,脉冲重复频率越高,可测量血流速度越高
E.显示多普勒频谱可直接向血流量

答案

参考答案:E

开放性试题

由中央文明办、中国教育电视台等单位共同承办的“共建和谐校园采访纪行”活动已全面启动。

(1)假如你是一名特约小记者,你一定会用自己的镜头记录校园生活中一些和谐的画面。请简要表述。(提示:不要出现真实的校名、人名)

                                                                                                                                                               

                                                                                                                                                              

                                                                                                                                                               

(2)难忘的初中生活结束了。在即将离开母校之际,请就如何走好初中之路为你的学弟学妹们留下忠告或祝福。

                                                                                                                                                              

                                                                                                                                                              

多项选择题