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水稻一生所经历的主要生育时期为播种期、出苗期、分蘖期、插秧(移栽)期、拔节期、孕穗期、抽穗期、开花期、成熟期和()期.

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古代的中庸之道,从消极的方面看,它扼杀了(),但另一方面,它又维护了传统的(),在封建社会有一定的积极意义,尽管在后来社会变革的过程中也阻碍了历史的发展。

留园的建造者是(),建造于()年。

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You add a property named ServiceContext to a control. You need the value of ServiceContext to flow to the child controls exactly like the value of the DataContext property of the FrameworkElement class. What should you do? ()

A. Inherit the control class from the DependencyObject class.
B. Register a dependency property. In the options settings of the property metadata, specify the Inherits option.
C. Declare a new property. In the get and set methods of the new property, create an instance of the TraversalRequest class.
Declare a new property. In the get method of the new property call VisualTreeHelper.GetParent. In the set method of the new property, call VisualTreeHelper.GetChild.

软开关电源工作方式的电路中,一般可分为()几类;

A. 零电压电路
B. 零电流电路
C. 零电压/电流共存电路

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