近年来电影又回到我们的身边,成为娱乐休闲的一个主要选择,下图为简易的电影放映机,

题型:选择题

问题:

近年来电影又回到我们的身边,成为娱乐休闲的一个主要选择,下图为简易的电影放映机,下列关于它的使用及原理的介绍中正确的是

[ ]

A.在屏幕上看到的是正立放大的虚像

B.电影片距镜头的距离很近,应在一倍焦距以内

C.要想使屏幕上的像大一些,镜头应后缩(即向左), 同时增大镜头与屏幕的距离

D.电影片中的人物景物等,正立地在镜头后快速移动着

考点:生活中的其他透镜(照相机,放大镜,投影仪等)
题型:选择题

任务型阅读。

Quick Work

     Ted Robinson has been worried all the week. Last Tuesday he

received a letter from the local police station. In the letter he was asked

to call at the station. Ted wondered why he was wanted by the police,

but he went to the station yesterday and he is not worried any more.

     At the station, he was told by a smiling policeman that his bicycle

had been found. Five days ago, the policeman told him, the bicycle was

picked up in a small village four hundred miles away. It is now being sent to his home by train.

    Ted was most surprised when he heard the news. He was happy, too, because he never expected the bicycle to be found. It was stolen twenty years ago when Ted was a boy of fifteen.

1. What happened last Tuesday?

                                                                                  

2. What was he told at the station?

                                                                                

3. What are the police doing with the bicycle?

                                                                                

4. Why was he surprised and happy?

                                                                                

5. How old was Ted when his bicycle was stolen?

                                                                                  

题型:选择题

从地面竖直上抛一物体,它两次经过A点的时间间隔为tA,两次经过B点的时间间隔为tB,且A点在B点下方,则AB相距(  )

A.

g
2
(
t2A
-
t2B
)

B.

g
4
(
t2A
-
t2B
)

C.

g
6
(
t2A
-
t2B
)

D.

g
8(
t2A
-
t2B
)

题型:选择题

在近代洋务运动中,洋务派提出的口号是[ ]

A、“向西方学习”

B、“自强”和“求富”

C、“民主”和“科学”

D、“扶清灭洋”

题型:选择题

男性,16岁,诊断为1型糖尿病10年,近2天出现恶心,面色潮红,呼吸加快,神志由模糊逐渐至昏迷,最可能的诊断是()

A.乳酸性酸中毒

B.糖尿病酮症酸中毒

C.糖尿病高渗昏迷

D.低血糖昏迷

E.尿毒症性昏迷

题型:选择题

稻田常见杂草有哪些?

更多题库