单项选择题

关于对焦下面理解不正确的是___。
A、使用手动对焦时，半按快门能转换成为自动对焦
B、对于静止或移动缓慢的对像，可以使用单次自动对焦
C、使用手动对焦模式拍摄时，必须旋转对焦环才能够准确对焦
D、使用手动对焦模式拍摄时，半按快门相机无法自动对焦

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单项选择题

( )属性是用于标识控制ID。

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单项选择题

Which of the following describe of endogeneity is not true?
A、From macro perspective, endogeneity represents issue generated within the system.
B、Potential reasons for endogeneity issue can be measurement error, explanatory variable omitted and simultaneity.
C、From micro perspective, endogeneity describes correlation between one or more explanatory variables and error term in the model.
D、Endogeneity will not destroy the uniformity parameter estimates.