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【单选题】
冷藏箱中雪藏食物时，冰块应放在食物的：（）
A.
下面
B.
上面
C.
前面
D.
后面
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举一反三
【单选题】光接收机中，雪崩光电二极管引入的噪声为（）
A.
光电检测器的暗电流噪声、雪崩管倍增噪声、光接收机的电路噪声
B.
量子噪声、雪崩管倍增噪声、光接收机的电路噪声
C.
量子噪声、光电检测器的暗电流噪声、光接收机的电路噪声
D.
量子噪声、光电检测器的暗电流噪声、雪崩管倍增噪声
【单选题】Teach Your Chlld Sclence 1．It is important to make your child interested in science from an early age．Most young children ask a lot of questions and you should give careful scientific answers．Don't on...
A.
What exactly is science?
B.
How do you find an explanation?
C.
What topics do you need?
D.
How do you answer your child's questions?
E.
Where does your child study science?
F.
How do you set up the experiment on saltand water?
第 23 题 Paragraph 1______________
第 23 题 Paragraph 1______________
【单选题】光接收机中，雪崩光电二极管引入的噪声为 ( )
A.
量子噪声、暗电流噪声、雪崩管倍增噪声、热噪声
B.
光电检测器的暗电流噪声、雪崩管倍增噪声、光接收机的电路噪声
C.
量子噪声、雪崩管倍增噪声、热噪声
D.
量子噪声、光电检测器的暗电流噪声、热噪声
相关题目：
【单选题】光接收机中，雪崩光电二极管引入的噪声为（）
A.
光电检测器的暗电流噪声、雪崩管倍增噪声、光接收机的电路噪声
B.
量子噪声、雪崩管倍增噪声、光接收机的电路噪声
C.
量子噪声、光电检测器的暗电流噪声、光接收机的电路噪声
D.
量子噪声、光电检测器的暗电流噪声、雪崩管倍增噪声
【单选题】Teach Your Chlld Sclence 1．It is important to make your child interested in science from an early age．Most young children ask a lot of questions and you should give careful scientific answers．Don't on...
A.
What exactly is science?
B.
How do you find an explanation?
C.
What topics do you need?
D.
How do you answer your child's questions?
E.
Where does your child study science?
F.
How do you set up the experiment on saltand water?
第 23 题 Paragraph 1______________
第 23 题 Paragraph 1______________
【单选题】光接收机中，雪崩光电二极管引入的噪声为 ( )
A.
量子噪声、暗电流噪声、雪崩管倍增噪声、热噪声
B.
光电检测器的暗电流噪声、雪崩管倍增噪声、光接收机的电路噪声
C.
量子噪声、雪崩管倍增噪声、热噪声
D.
量子噪声、光电检测器的暗电流噪声、热噪声
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