皮皮学，免费搜题
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【多选题】
根据噪声来源,光电探测器的噪声有几种形式?
A.
散粒噪声
B.
热噪声
C.
低频噪声
D.
背景噪声
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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举一反三
【单选题】在显微镜下，物像不清晰时，应转动显微镜的哪一部分?( )
A.
目镜
B.
物镜
C.
调节器
D.
反光镜
查看完整题目与答案
【单选题】He __________ in the factory for three years before he joined the Army. [     ]
A.
has worked
B.
worked
C.
had worked l
查看完整题目与答案
【单选题】听力原文：Who is the gentleman dressed in dark blue? (A) She works at the car factory. (B) He is the manager of human resources. (C) He likes to play basketball. (13)
A.
B.
C.
查看完整题目与答案
【单选题】The news came as no surprise to me. I for some time that the factory was going to shut down.
A.
knew
B.
had known
C.
have known
D.
know
查看完整题目与答案
【单选题】在显微镜下,物像不清晰时,应转动显微镜的()部分。
A.
目镜
B.
物镜
C.
载物台
D.
粗调或细调螺旋
查看完整题目与答案
【单选题】When the factory worker in the third paragraph was a teenager, his father______.
A.
wanted him to start earning a living
B.
wanted him to study harder
C.
wanted him to work with him at the Ford plant
D.
wanted him to stop wearing such messy clothes
查看完整题目与答案
【单选题】H e ___ a visit to the factory and was warmly ___ by the workers there .
A.
took , welcome
B.
took ,welcomed
C.
paid , welcome
D.
paid , welcomed
查看完整题目与答案
【单选题】在光学显微镜下,物像不清晰时,应转动显微镜的()部分。
A.
目镜
B.
物镜
C.
载物台
D.
粗调或细调螺旋
查看完整题目与答案
【单选题】在显微镜下,物像不清晰时,应转动显微镜的()部分。
A.
目镜
B.
物镜
C.
载物台
D.
粗调或细调螺旋
查看完整题目与答案
【多选题】收入效应和总效应与价格的变动关系,下列叙述正确的有( )
A.
对于正常商品而言，其替代效应与价格成反向变动，收入效应也与价格成反向变动，从而总效应必定与价格成反向变动
B.
对于低档商品而言，其替代效应与价格成反应变动，收入效应与价格成同向变动，且收入效应大于替代效应，从而总效应与价格成同方向变动
C.
对于吉芬物品而言，其替代效应与价格成反应变动，收入效应与价格成同向变动，且收入效应小于替代效应，从而总效应与价格成反方向变动
D.
正常物品和低档物品的区别不对它们各自的替代效应产生影响，所以对于所有商品而言，替代效应与价格都成反向变动关系。
查看完整题目与答案
相关题目：
【单选题】在显微镜下，物像不清晰时，应转动显微镜的哪一部分?( )
A.
目镜
B.
物镜
C.
调节器
D.
反光镜
查看完整题目与答案
【单选题】He __________ in the factory for three years before he joined the Army. [     ]
A.
has worked
B.
worked
C.
had worked l
查看完整题目与答案
【单选题】听力原文：Who is the gentleman dressed in dark blue? (A) She works at the car factory. (B) He is the manager of human resources. (C) He likes to play basketball. (13)
A.
B.
C.
查看完整题目与答案
【单选题】The news came as no surprise to me. I for some time that the factory was going to shut down.
A.
knew
B.
had known
C.
have known
D.
know
查看完整题目与答案
【单选题】在显微镜下,物像不清晰时,应转动显微镜的()部分。
A.
目镜
B.
物镜
C.
载物台
D.
粗调或细调螺旋
查看完整题目与答案
【单选题】When the factory worker in the third paragraph was a teenager, his father______.
A.
wanted him to start earning a living
B.
wanted him to study harder
C.
wanted him to work with him at the Ford plant
D.
wanted him to stop wearing such messy clothes
查看完整题目与答案
【单选题】H e ___ a visit to the factory and was warmly ___ by the workers there .
A.
took , welcome
B.
took ,welcomed
C.
paid , welcome
D.
paid , welcomed
查看完整题目与答案
【单选题】在光学显微镜下,物像不清晰时,应转动显微镜的()部分。
A.
目镜
B.
物镜
C.
载物台
D.
粗调或细调螺旋
查看完整题目与答案
【单选题】在显微镜下,物像不清晰时,应转动显微镜的()部分。
A.
目镜
B.
物镜
C.
载物台
D.
粗调或细调螺旋
查看完整题目与答案
【多选题】收入效应和总效应与价格的变动关系,下列叙述正确的有( )
A.
对于正常商品而言，其替代效应与价格成反向变动，收入效应也与价格成反向变动，从而总效应必定与价格成反向变动
B.
对于低档商品而言，其替代效应与价格成反应变动，收入效应与价格成同向变动，且收入效应大于替代效应，从而总效应与价格成同方向变动
C.
对于吉芬物品而言，其替代效应与价格成反应变动，收入效应与价格成同向变动，且收入效应小于替代效应，从而总效应与价格成反方向变动
D.
正常物品和低档物品的区别不对它们各自的替代效应产生影响，所以对于所有商品而言，替代效应与价格都成反向变动关系。
查看完整题目与答案