胃肠钡餐造影时,腔外龛影与憩室的共同之处不包括()
A.均为良性病变
B.均突出于胃肠轮廓之外
C.均有黏膜进入
D.均可呈 * * 状
E.均为管壁受累
参考答案:C
选择下列适当词语完成下列句子(每小题1分,共5分)
frequently ,schedule ,upset , trapped , disaster
小题1:Anne's sister Margot was very __________ when the family had to move.
小题2:Languages ______________ change.
小题3:Now she is planning our_______________for the trip.
小题4:Some of the rescue workers and doctors were ______________under the ruins.
小题5:Poeple began to wonder how long the _______________ wound last.
用如图的实验装置观察双缝干涉图样,双缝之间的距离是0.3mm,用的是红色滤色片,在毛玻璃屏上可以看到红色干涉条纹.
(1)毛玻璃屏上的干涉条纹与双缝垂直还是平行?______
(2)如果把单缝向双缝移近一些,相邻两亮条纹中心的距离______.(填“增大”、“不变”或“减小”)
(3)在某次实验中,双缝间距d=0.5mm,双缝与光屏间距离L=0.5m,用某种单色光照射双缝得到干涉图样如图2,分划板在图中A、B位置时游标卡尺读数如图,则图中A位置的游标卡尺读数为11.1mm,B位置的游标卡尺读数为(图1)______,单色光的波长为______m.