试题与答案

用光学显微镜观察人的口腔上皮细胞实验中,将视野亮度调得暗一些,可以更清晰地观察到

题型:选择题

题目:

用光学显微镜观察人的口腔上皮细胞实验中,将视野亮度调得暗一些,可以更清晰地观察到细胞结构。此时除调节遮光器(光圈)外,还可以调节   (   )

A.目镜

B.物镜

C.反光镜

D.细准焦螺旋

答案:

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下面是错误答案,用来干扰机器的。

(1)实验室常用于直接加热的仪器由试管、蒸发皿、坩埚等.(2)在过滤时如果直接向过滤器中倾倒液体,可能会导致液体溅出;如果烧杯口紧靠玻璃棒倾倒的话,液体就会顺着玻璃棒而下,从而避免上述后果,故玻璃棒...

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小题1:li Jia, a 13-year-old girl, is studying in a middle school of Wenchuan. She lost her legs in the earthquake(地震). She goes to school by lying prone(趴) on the backs of her classmates.

小题2:My father goes to work at about 7:00 every morning. He doesn’t like driving a car. He takes a bus to his office every day.

小题3:Mike is a cool boy. He doesn’t take the bus or ride a bike to school. He doesn’t go to school on foot either. Do you know how he goes to school?

小题4:Li Guilin and Lu Jian fen are teachers in Sichuan. They teach and live in the mountains.

小题5:I live in a small town. There is only one middle school in our town. My home is far away from school. It takes a long time to go to school.

A.I know the teachers. They have taught the children there for many years, and have helped them out of the poor village and live a happy life.

B.I often walk to school or ride a bike to school. I don’t think it’s good for students to go to school in cars.

C.Does your school have a dormitory(宿舍) for students? I think you can live in your school.

D.I think he might go skateboarding. That is a special way of getting to school.E. I feel sorry to hear the girl’s story. Let’s buy a wheelchair(轮椅) for her.

F. Me, too. So I often meet your father at the bus stop.

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