-
针状马氏体在光学显微镜下观察呈针状,在电镜下观察发现其亚结构主要是孪晶。选项: A:对 B:错
-
Have you ever been ill? When you are ill, you must be unhappy because your body becomes hot, and there are pains all over your body. You don’t want to work, you stay in bed, feeling very sad. What makes us ill? It is germs(细菌). Germs are everywhere. They are very small and you can’t find them with your eyes, but you can see them with a microscope(显微镜). They are very small and there could be hundreds of them on a very small thing. Germs are always found in dirty water. When we look at dirty water under the microscope, we shall see them in it. So your father and mother will not let you drink dirty water. Germs aren’t found only in water. They are found in air and dust. If you cut your finger, if some of the dust from the floor goes into the cut(割开处), some of the germs would go into your finger. Your finger would become big and red, and you will have much pain in it. Sometimes the germs would go into all of your body, and you would have pain everywhere. What’s the main idea of the passage? 选项: A: Germs may make us ill. B: Germs are in dirty water. C: Don’t drink dirty water. D: Take care of your fingers
-
阅读下列文章,选出以下3道题的最佳选项。Have you ever been ill? When you are ill, you must be unhappy because your body becomes hot, and there are pains all over your body. You don’t want to work, you stay in bed, feeling very sad.What makes us ill? It is germs(细菌). Germs are everywhere. They are very small and you can’t find them with your eyes, but you can see them with a microscope(显微镜). They are very small and there could be hundreds of them on a very small thing.Germs are always found in dirty water. When we look at dirty water under the microscope, we shall see them in it. So your father and mother will not let you drink dirty water.Germs aren’t found only in water. They are found in air and dust. If you cut your finger, if some of the dust from the floor goes into the cut(割开处), some of the germs would go into your finger. Your finger would become big and red, and you will have much pain in it. Sometimes the germs would go into all of your body, and you would have pain everywhere.(1) What’s the main idea of the passage? 选项: A: Germs may make us ill. B: Germs are in dirty water. C: Don’t drink dirty water. D: Take care of your fingers
-
脑脊液显微镜检查中白细胞和中性粒细胞增高最明显的是() 选项: A、 结核性脑膜炎 B、 病毒性脑膜炎 C、 脑出血 D、 化脓性脑膜炎 E、 隐球菌性脑膜炎
-
植物病害诊断程序的第一步为( )。选项: A:调查询问病史 B:田间的观察 C:显微镜观察 D:确定病原
-
以下关于包涵体说法正确的是()
选项: A:有些病毒能在易感细胞中形成包含体。 B:包含体的形成有个过程,出现率也不是100%。 C:经特殊染色后,用普通光学显微镜检查。 D:有些病毒能在易感细胞外形成包含体。
-
奶牛乳腺炎常用的检查方法不包括选项: A:触诊; B:乳汁显微镜检查; C:乳汁化学分析; D:乳房穿刺
-
奶牛乳腺炎常用的检查方法不包括选项: A:视诊; B:触诊; C:乳房穿刺; D:乳汁化学分析; E:乳汁显微镜检查
-
奶牛乳腺炎常用的检查方法不包括选项: A:视诊; B:触诊; C:乳汁化学分析; D:乳房穿刺; E:乳汁显微镜检查
-
病毒必须借助()显微镜才能观察。