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【单选题】
某学生在显微镜下观察标本切片,当转动细调节螺旋时,有一部分细胞看得清晰,另一部分细胞较A.
，这是由于( )
B.
反光镜未调节好
C.
标本切得厚薄不均
D.
细调节螺旋未调节好
E.
显微镜物镜损坏
F.
聚光镜光圈大小不适合
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举一反三
【单选题】The influential Peruvian development economist Hernando de Soto has argued that much of the developing world will fail to reap the benefits of capitalism until _____.
A.
they have political stability
B.
they invest in infrastructural development
C.
they have better defined and secure property rights
D.
they have adequate market regulation
【单选题】当吉芬品价格上升时,应该有()
A.
替代效应为正值，收入效应为负值，且前者的作用小于后者
B.
替代效应为负值，收入效应为正值，且前者的作用小于后者
C.
替代效应为负值，收入效应为正值，且前者的作用大于后者
D.
无法确定
【单选题】The influential Peruvian development economist Hernando de Soto has argued that much of the developing world will fail to reap the benefits of capitalism until they:
A.
have political stability.
B.
invest in infrastructural development.
C.
have better defined and secure property rights.
D.
have adequate market regulation.
【简答题】一、设样品长 8mm 、宽 2mm 、厚 0.2mm 的 Ge, 在样品长度两端加 1.0V 的电压,得到沿 x 方向的电流 10mA ,再沿样品垂直方向( +z) 加 0.2T 的磁场,则在样品宽度两端测得电压为 10mV ,沿 -y 方向,设材料主要是一种载流子导电,试求:材料的导电类型、霍耳系数、载流子浓度、载流子迁移率。 二、 室温时测得 Si 的霍耳系数为零,已知电子和空穴的迁移率分别为...
【单选题】The influential Peruvian development economist Hernando de Soto has argued that much of the developing world will fail to reap the benefits of capitalism until _____.
A.
they have political stability
B.
they invest in infrastructural development
C.
they have better defined and secure property right
D.
they have adequate market regulation
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