【简答题】(1)成像像特点:物体在平面镜里成的是______像,像的大小和物体的大小______,像和物的连线与镜面______,像和物到镜面的距离______.平面镜所成的像和物以______对称. (2)利用平面镜可以改变光的传播方向.
【单选题】患儿8个月,生后6个月内生长发育好,近2个月呆滞,面黄。检查:四肢及唇舌抖,舌炎,腱反射亢进,踝阵挛阳性。血象Hb65g/L,RBCI.5×1012/L,WBC4.×109/L,中性粒细胞15%,淋巴细胞80%,单核细胞5%,中性粒细胞有核右移。患儿最可能的诊断是
【简答题】平面镜成像特点是:(1)像和物到______的距离相等;(2)像与物体大小______;(3)像和物体的连线与______垂直;(4)像和物体的左右______;(5)成的是______像.
【单选题】患儿8个月,生后6个月内生长发育好,近2个月呆滞,面黄。检查:四肢及唇舌抖,舌炎,腱反射亢进,踝阵挛阳性。血象Hb65g/L,RBCI.5 ×1012/L,WBC4.5 × 109/L,中性粒细胞15%,淋巴细胞80%,单核细胞5%,中性粒细胞有核右移。患儿最可能的诊断是
【单选题】听力原文:W: What's the problem? M: I can't figure out how to put the page numbers on. I've done everything and they aren't showing up. W: Let's see. Did you press Shift F8? M: Yes, I did that. Then I hit ...
A.
The man is learning how to use a computer.
B.
The woman is showing the man how to put page numbers on a document.
C.
The man is printing a document.
D.
The man is using his computer to do mathematical functions.
【简答题】平面镜成像的特点: (1)物体在平面镜里成的是____像; (2)像的大小与物体的大小____; (3)像与物的连线与镜面____; (4)像到镜面的距离与物体到镜面的距离____。
【单选题】手机在给我们的生活和工作带来方便的同时,也带来许多新的困扰。这表明()
【单选题】听力原文:W: What's the problem? M: I can't figure out how to put the page numbers on. I've done everything and they aren't showing up. W: Let's see. Did you press Shift F8? M: Yes, I did that. Then I hit ...
A.
The man is learning how to use a computer.
B.
The woman is showing the man how to put page numbers on a document.
C.
The man is printing a document.
D.
The man is using his computer to do mathematical functions.
【简答题】平面镜成像特点:(1)像与物体大小 ;(2)像到镜面的距离 物体到镜面的距离;(3)像与物体的连线与镜面 ;(4)平面镜成的是 像。