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【简答题】
在做 “研究凸透镜成像规律”的实验中,所用凸透镜的焦距是 20cm . (1)将蜡烛和凸透镜的位置固定,移动光屏直至光屏距透镜 30cm 处,光屏上出现了清晰的像,这个像是倒立、 _______ 的实像,在投影仪、照相机、放大镜三种光学器件中与上述成像情况一致的是 _______ . (2)生活中用相机拍照时,为了拍到自己的全身照,他和镜头之间的距离应 (增大/减小)。 (3)如上图所示,当光屏上呈现清晰的像时,将透镜换成了一个凸度更大的 凸透镜,那么在保持蜡烛和透镜位置不变的情况下,光屏向 (左/右)移动才可以再次呈现清晰的像。
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参考答案：
举一反三
【单选题】He ___ his leg when he __ in a football match against another school.
A.
broke, played
B.
was breaking, was playing
C.
broke , was playing
D.
was breaking, played
查看完整题目与答案
【判断题】月夜练枪，象征着沙子龙的妥协退让与国术即将消逝。()
A.
正确
B.
错误
查看完整题目与答案
【单选题】听力原文：M: Aren't we supposed to be at Jim's house by five o'clock? W: Five or five-thirty. He said it didn't make any difference. What time did Jim wish these two people to beat his house?
A.
Before five o'clock.
B.
At five o'clock.
C.
After five o'clock.
D.
Any time around five.
查看完整题目与答案
【单选题】糖尿病病人应用胰岛素治疗，此作用属于
A.
补充治疗
B.
对症治疗
C.
对因治疗
D.
安慰治疗
E.
以上都不对
查看完整题目与答案
【单选题】After the five ,very little of the house _______standing .
A.
remained
B.
kept
C.
rested
D.
left
查看完整题目与答案
【简答题】The White House is open to the public ________. A) on weekdays only B) five days a week C) every other day D) on weekends only
查看完整题目与答案
【单选题】He had a serious car (accident) last week and (broke) his left leg because he got (drunk) and drove too (fastly).
A.
accident
B.
broke
C.
drunk
D.
fastly
查看完整题目与答案
【简答题】解不等式：x（x-3）＜3x（x+2）-2x 2 -3
查看完整题目与答案
【判断题】极限误差就是最大的抽样误差，因此，总体指标必然落在样本指标和极限误差共同构成的区间之内。（）
A.
正确
B.
错误
查看完整题目与答案
【单选题】细菌生长繁殖的最适宜温度是
A.
25℃
B.
30℃
C.
33℃
D.
37℃
E.
47℃
查看完整题目与答案
相关题目：
【单选题】He ___ his leg when he __ in a football match against another school.
A.
broke, played
B.
was breaking, was playing
C.
broke , was playing
D.
was breaking, played
查看完整题目与答案
【判断题】月夜练枪，象征着沙子龙的妥协退让与国术即将消逝。()
A.
正确
B.
错误
查看完整题目与答案
【单选题】听力原文：M: Aren't we supposed to be at Jim's house by five o'clock? W: Five or five-thirty. He said it didn't make any difference. What time did Jim wish these two people to beat his house?
A.
Before five o'clock.
B.
At five o'clock.
C.
After five o'clock.
D.
Any time around five.
查看完整题目与答案
【单选题】糖尿病病人应用胰岛素治疗，此作用属于
A.
补充治疗
B.
对症治疗
C.
对因治疗
D.
安慰治疗
E.
以上都不对
查看完整题目与答案
【单选题】After the five ,very little of the house _______standing .
A.
remained
B.
kept
C.
rested
D.
left
查看完整题目与答案
【简答题】The White House is open to the public ________. A) on weekdays only B) five days a week C) every other day D) on weekends only
查看完整题目与答案
【单选题】He had a serious car (accident) last week and (broke) his left leg because he got (drunk) and drove too (fastly).
A.
accident
B.
broke
C.
drunk
D.
fastly
查看完整题目与答案
【简答题】解不等式：x（x-3）＜3x（x+2）-2x 2 -3
查看完整题目与答案
【判断题】极限误差就是最大的抽样误差，因此，总体指标必然落在样本指标和极限误差共同构成的区间之内。（）
A.
正确
B.
错误
查看完整题目与答案
【单选题】细菌生长繁殖的最适宜温度是
A.
25℃
B.
30℃
C.
33℃
D.
37℃
E.
47℃
查看完整题目与答案
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